King Koil Mattress Review

Last updated on

Based on 598 verified customer experiences from 8 unique sources.

 

What You Need to Know about the King Koil Innerspring Mattress

Mattress Type and Components: King Koil offers innerspring, hybrid, and memory foam mattresses. A total of 20 mattresses are available as part of five exclusive collections.

  • The World Edition collection includes the following five innerspring models:
    • The Siena Firm features a comfort layer made of polyfoam. The support core features pocketed coils, followed by a polyfoam base layer. The quilted cover is infused with gel foam.
    • The Sydney Firm is designed with a polyfoam comfort layer and a pocketed coil support core reinforced with a polyfoam base layer. The quilted cover is infused with gel foam.
    • The Sydney Euro Top is constructed with a polyfoam comfort layer. The support core features pocketed coils over a polyfoam base layer, and the quilted cover is infused with gel foam.
    • The Monaco Plush has a polyfoam comfort system. The support core features pocketed coils reinforced with gel memory foam in the center, as well as a polyfoam base layer. The quilted cover is infused with gel foam.
    • The Monaco Euro Top has a polyfoam comfort system with an additional ‘lumbar support’ bottom layer. The pocketed coil support core is reinforced with gel memory foam in the center, and supported with a polyfoam base layer. The cover is quilted and infused with gel foam.
  • The following six mattresses are part of the World Luxury collection. The Kingsley models are innersprings, and the Montego models are listed as hybrids.
    • The Kingsley Firm features layers of memory foam and polyfoam in the comfort layer. The support core is constructed with foam-encased pocketed coils and a polyfoam base layer. The cover is blended from silk and wool and infused with gel foam.
    • The Kingsley Plush is designed with layers of memory foam and polyfoam in the comfort system. The support core features pocketed coils with a foam encasement, followed by a polyfoam base layer. The cover is blended from silk and wool and infused with gel foam.
    • The Kingsley Euro Top features a comfort layer made of memory foam with two insert layers of polyfoam. The support core has pocketed coils encased in foam, followed by a polyfoam base layer. The cover is blended from silk and wool and infused with gel foam.
    • The Montego Luxury Firm has a comfort layer with layers of memory foam, gel memory foam, and polyfoam. The support core features pocketed coils encased in foam, and the cover is a silk and wool blend infused with gel foam.
    • The Montego Luxury Plush is designed with a memory foam comfort layer and a pocketed coil support core encased in foam. The cover is made of a silk-wool blend infused with gel foam.
    • The Montego Luxury Pillow Top features a comfort system with layers of gel memory foam and polyfoam, as well as memory foam inserts. The support core is constructed with foam-encased pocketed coils, and the cover is made of a silk and wool blend infused with gel foam.
  • The next two hybrid mattresses are sold as part of the World Extended Life collection:
    • The Athens Firm has a comfort system with a layer of Talalay latex buffered with top and bottom layers of high-density polyfoam. The pocketed coil support core is encased in foam, and the fabric cover is infused with gel foam.
    • The Athens Plush has a top layer of high-density polyfoam and a bottom layer of Talalay latex in the comfort system, and a pocketed coil support core encased in foam. The fabric cover is infused with high-density foam.
  • These three hybrid mattresses are part of the World Luxury Intimate collection:
    • The Vienna Plush has a comfort system with layers of Joma wool, gel memory foam, latex, and memory foam. The pocketed coil support core is encased in foam.
    • The Vienna Firm features a comfort system with Joma wool, gel memory foam, latex, and memory foam layers. It also has a pocketed coil support core encased in foam.
    • The Vienna Euro Top has layers of Joma wool, gel memory foam, latex, memory foam, and microcoils. The support core features pocketed coils encased in foam.
  • The final four mattresses are included in the iMattress collection. The G10 Firm and G12 Plush are memory foam mattresses, and the XS 10 Hybrid Firm and XS 50 are hybrid mattresses.
    • The G10 Firm features a memory foam comfort layer and a high-density polyfoam support core. The cover is infused with copper yarns.
    • The G12 Plush features a memory foam comfort system and a support core constructed from high-density polyfoam. The fabric cover is infused with copper yarns.
    • The XS 10 Hybrid Firm is designed with a memory foam comfort layer and a pocketed coil support core. The fabric cover is infused with copper yarns.
    • The XS 50 Hybrid Plush features a memory foam comfort layer, a pocketed coil support core, and a fabric cover infused with copper yarns.

Pros:

  • Wide range of designs, thicknesses, and firmness options
  • Good overall edge support
  • A+ BBB rating

Cons:

  • Questionable durability
  • Limited specification disclosures
  • Availability largely limited to eastern U.S.

Product and Price Range: King Koil mattresses are available in six sizes: Twin, Twin XL, Full, Queen, King, and California King; please note that some models may not be sold in all sizes. The price range for these mattresses will vary by size and selected model; a full pricing comparison chart is found in the ‘Pricing and Delivery Details’ section. All King Koil mattresses are manufactured in the United States.

Customer Satisfaction Rating: 63% to 67% (varies by mattress collection)
Calculated from: 598 customer experiences from 8 individual sources

Main Competitors: King Koil’s primary competitors include other mattress brands that sell their products through brick-and-mortar retailers.
Availability: King Koil mattresses are exclusively sold through third-party retailers, and are not available for purchase on the King Koil website.
Amazon rating: None of King Koil’s current mattress models are available for sale on Amazon.com.
BBB rating: A+

 

King Koil Customer Satisfaction Rating Comparison

King Koil Mattress Sleep Ratings

Please note that mattress sleep ratings for King Koil are by mattress collection, not specific models.

CategoryCriteriaKing Koil RatingWhat King Koil Users Say
Customer SatisfactionBased on data collection, this is an overall customer sentiment regarding King Koil mattresses.63% (World Edition)
64% (World Luxury and World Extended Life)
65% (World Luxury Intimate)
66% (iMattress)
Based on customer feedback, King Koil mattress collections have earned average to below-average satisfaction ratings compared to the average ratings for their respective mattress type.
Durability The average mattress will perform for approximately seven years before it needs to be replaced.Poor Durability is a common complaint among King Koil owners; mattresses often develop sagging and begin to deteriorate after less than five years of use.
Motion IsolationInnerspring/hybrid mattresses that are overly responsive will create excessive motion when someone gets up or shifts positions in bed. Most memory foam mattresses minimize and isolate motion more effectively, and can cut down on sleep disruptions.Good (iMattress)
Fair (all other collections)
The iMattress collection — particularly all-foam models — isolate transfer so a noticeable extent, but models in the other collections offer minimal motion isolation.
Sex Bouncier, more responsive beds (such as innersprings and hybrids) tend to be more enjoyable for sex than foam-based mattress models.Good (all collections)Most King Koil mattresses are fairly responsive and bouncy, and couples who own them say they are good for sex.
ConformingMemory foam mattresses are designed to conform closely to the sleeper’s body and alleviate bodily pressure. Innersprings and hybrids tend to conform less, resulting in lower amounts of pressure relief.Good (iMattress)
Fair (all other collections)
iMattress models conform closer than other King Koil mattresses, providing a contoured fit with some pressure and pain relief. Our feedback indicates that higher-cost models conform closer than lower-cost models.
Temperature NeutralityInnerspring mattresses tend to retain less body heat than other mattress types, and will sleep cooler as a result. By comparison, memory foam beds sleep somewhat hot.Good (all collections)Most King Koil mattress owners report minimal heat retention and say their mattress sleeps fairly cool. Models with thicker comfort systems tend to sleep hottest.
Off-gassingSome mattresses emit particles when they are unpackaged, accompanied by unpleasant ‘off-gassing’ smells that can last for days.Good (all collections)Off-gassing does not appear to be a major issue with King Koil mattresses, and few owners report excessively strong and/or long-lasting odors.
Edge SupportThe frames of innerspring and hybrid mattresses are encased to support the springs and provide a suitable sleeping surface. Memory foam mattresses, on the other hand, typically have poor edge support and may prematurely sink in spots where people sit.Very Good (all other collections)
Good (iMattress)
Edge support seems to be a key strength among King Koil mattresses, particularly innersprings and hybrids with reinforced support cores. Foam mattresses offer less edge support, but minimal sinkage has been reported.
NoiseInnerspring mattresses tend to be somewhat noisy due to their high levels of bounciness and responsiveness, as well as squeaky metal components; most all-foam mattresses produce little to no noise.Good (iMattress)
Fair (all other collections)
Foam mattresses in the iMattress collection are virtually silent when bearing weight. King Koil innersprings and hybrids may be somewhat noisy, but the pocketed coils minimize creaking to some extent.
Ease of Moving and RotatingAll mattresses are relatively heavy, but some are more unwieldy and difficult to move than others.Fair (all collections)The average King Koil mattress weighs roughly 105 pounds, but individual models range from less than 60 pounds to more than 140 pounds.
 

King Koil Innerspring Price Comparison

King Koil Innerspring Pricing and Delivery Details

The first table lists width, length, and height ranges for all five King Koil mattress collections. Please note that thickness measurements are not disclosed for the World Luxury Intimate and iMattress collections.

SizeDimensions Height Availability Notes
Twin39W” x 75L”11 1/2″ to 13″ (World Edition)
12″ to 14 1/2″ (World Luxury)
Not available for:
Athens Firm
Athens Plush
Vienna Plush
Vienna Firm
Vienna Euro Top
G10 Firm
G12 Plush
Twin Extra Long (XL)39W” x 80L”11 1/2″ to 13″ (World Edition)
12″ to 14 1/2″ (World Luxury)
Not available for:
Athens Firm
Athens Plush
Vienna Plush
Vienna Firm
Vienna Euro Top
Full54W” x 75L”11 1/2″ to 13″ (World Edition)
12″ to 14 1/2″ (World Luxury)
Not available for:
Athens Firm
Athens Plush
Vienna Plush
Vienna Firm
Vienna Euro Top
G10 Firm
G12 Plush
Queen60W” x 80L”11 1/2″ to 13″ (World Edition)
12″ to 14 1/2″ (World Luxury)
13 1/2″ (World Extended Life)
Available for all models
King76W” x 80L”11 1/2″ to 13″ (World Edition)
12″ to 14 1/2″ (World Luxury)
13 1/2″ (World Extended Life)
Available for all models
California King72W” x 84L”12″ to 13″ (World Edition)
12″ to 14 1/2″ (World Luxury)
13 1/2″ (World Extended Life)
Not available for:
Siena Firm
Vienna Plush
Vienna Firm
Vienna Euro Top
G10 Firm
G12 Plush

The next table lists prices for each current King Koil mattress in all available sizes.

CollectionModelTwinTwin XLFullQueenKing Cali King
World EditionSiena Firm$549$599$599$699$799N/A
Sydney Firm$749$799$799$899$1,099$1,099
Sydney Euro Top$849$899$899$999$1,199$1,199
Monaco Plush$949$999$999$1,099$1,299$1,299
Monaco Euro Top$1,049$1,099$1,099$1,199$1,399$1,399
World LuxuryKingsley Firm$1,149$1,349$1,349$1,399$1,699$1,699
Kingsley Plush$1,149$1,349$1,349$1,399$1,699$1,699
Kingsley Euro Top$1,349$1,449$1,449$1,499$1,799$1,799
Montego Luxury Firm$1,249$1,449$1,449$1,499$1,799$1,799
Montego Luxury Plush$1,249$1,449$1,449$1,499$1,799$1,799
Montego Luxury Pillow Top$1,349$1,549$1,549$1,599$1,899$1,899
World Extended LifeAthens FirmN/AN/AN/A$1,999$2,399$2,399
Athens PlushN/AN/AN/A$1,999$2,399$2,399
World Luxury IntimateVienna PlushN/AN/AN/A$2,899$3,199N/A
Vienna FirmN/AN/AN/A$2,899$3,199N/A
Vienna Euro TopN/AN/AN/A$3,199$3,699N/A
iMattressG10 FirmN/A$849N/A$999$1,199N/A
G12 PlushN/A$949N/A$1,099$1,299N/A
XS 10 Hybrid Firm$1,299$1,489$1,574$1,749$2,179N/A
XS 50 Hybrid Plush$1,399$1,589$1,674$1,849$2,279N/A

Delivery Policy: King Koil mattresses are exclusively available for purchase at brick-and-mortar retail locations. Customers should defer to the delivery policy of the retailer where they purchase their mattress.

Old Mattress Removal: King Koil does not offer old mattress services. Customers should defer to the mattress removal policy of the retailer where they purchase their King Koil mattress.

 

King Koil Product Specifications and Firmness

The firmness of a King Koil mattress varies by selected model. A breakdown of firmness and construction specifications is found in the table below, but please note that King Koil does not disclose certain specs (such as thickness or foam density) for certain models/collections.

King Coil CollectionProduct NameFirmness OptionsThicknessSupport Core ComponentsComfort Layer ComponentsCover Components
World EditionSiena Firm7 (Firm)11 1/2″8″ Pocketed Coils (789 Coil Count)
1 1/2″ Base Polyfoam
1″ Polyfoam1″ Quilted Fabric Infused with Gel Foam
Sydney Firm5.5 (Medium)12″8″ Pocketed Coils (789 Coil Count)
1 1/2″ Base Polyfoam
1″ Polyfoam1 1/2″Quilted Fabric Infused with Gel Foam
Sydney Euro Top4 (Medium Soft)12″8″ Pocketed Coils (789 Coil Count)
1 1/2″ Base Polyfoam
1″ Polyfoam1 1/2″Quilted Fabric Infused with Gel Foam
Monaco Plush3 (Soft)13″8″ Pocketed Coils (789 Coil Count)
1 1/2″ Base Polyfoam
1 1/2″ Polyfoam
1/2″ Memory Foam Insert
1 1/2″Quilted Fabric Infused with Gel Foam
Monaco Euro Top5.5 (Medium)12 1/2″8″ Pocketed Coils (789 Coil Count)
1 1/2″ Base Polyfoam
1 1/2″ Polyfoam
1/2″ Memory Foam Insert
1 1/2″Quilted Fabric Infused with Gel Foam
World LuxuryKingsley Firm5.5 (Medium)13″8″ Pocketed Coils (1,022 Coil Count)
1 1/2″ Base Polyfoam
1″ Memory Foam
1″ Polyfoam
1 1/2″ Silk and Wool Blend Infused with Gel Foam
Kingsley Plush4 (Medium Soft)13 1/2″8″ Pocketed Coils (1,022 Coil Count)
1 1/2″ Base Polyfoam
1″ Memory Foam
1 1 /2″ Polyfoam
1 1/2″ Silk and Wool Blend Infused with Gel Foam
Kingsley Euro Top3 (Soft)12″8″ Pocketed Coils (1,022 Coil Count)
1 1/2″ Base Polyfoam
1″ Memory Foam with 2 Polyfoam Inserts 1 1/2″ Silk and Wool Blend Infused with Gel Foam
Montego Luxury Firm5.5 (Medium)14″8″ Pocketed Coils (1,022 Coil Count)
1 1/2″ Base Polyfoam
1″ Memory Foam
1″ Gel Memory Foam
1″ Polyfoam
1 1/2″ Silk and Wool Blend Infused with Gel Foam
Montego Luxury Plush3 (Soft)14″8″ Pocketed Coils (1,022 Coil Count)
1 1/2″ Base Polyfoam
2″ Memory Foam
1″ Gel Memory Foam
1 1/2″ Silk and Wool Blend Infused with Gel Foam
Montego Luxury Pillow Top4 (Medium Soft)13″8″ Pocketed Coils (1,022 Coil Count)
1 1/2″ Base Polyfoam
1″ Polyfoam
1″ Gel Memory Foam
2″ Memory Foam Inserts
1 1/2″ Silk and Wool Blend Infused with Gel Foam
World Extended LifeAthens Firm7 (Firm)13 1/2″8″ Pocketed Coils (1,022 Coil Count)
1 1/2″ Base Polyfoam
2″ Talalay Latex
1″ HD Polyfoam
Fabric Infused with Gel Foam
Athens Plush5.5 (Medium)13 1/2″8″ Pocketed Coils (1,022 Coil Count)
1 1/2″ Base Polyfoam
1″ Polyfoam
2″ Talalay Latex
Fabric Infused with HD Foam
World Luxury IntimateVienna Plush4 (Medium Soft)N/APocketed Coils
Base Polyfoam
Joma Wool
Gel Memory Foam
Latex
Memory Foam
Quilted Fabric
Vienna Firm5.5 (Medium)N/APocketed Coils
Base Polyfoam
Joma Wool
Gel Memory Foam
Latex
Memory Foam
Quilted Fabric
Vienna Euro Top4 (Medium Soft)N/APocketed Coils
Base Polyfoam
Joma Wool
Gel Memory Foam
Latex
Memory Foam
Microcoils
Quilted Fabric
iMattressG10 Firm5.5 (Medium)N/AHD PolyfoamMemory FoamFabric Infused with Copper Yarns
G12 Plush4 (Medium Soft)N/AHD PolyfoamMemory FoamFabric Infused with Copper Yarns
XS 10 Hybrid Firm5.5 (Medium)N/APocketed Coils (630 Coil Count)Memory FoamFabric Infused with Copper Yarns
XS 50 Hybrid Plush4 (Medium Soft)N/APocketed Coils (630 Coil Count)Memory FoamFabric Infused with Copper Yarns

Firmness is rated on a scale of 1 to 10. For more information on how firmness is calculated, please visit our Mattress Firmness page.

 

What Type of Sleeper Is Best Suited for a King Koil Mattress?

Based on our customer feedback, King Koil mattresses received the following grades among sleepers of different weights and preferred sleep positions. Ratings are sorted by mattress collection, not individual model; sleeper experiences may vary between different models in the same collection. Please note that these ratings are subjective, and that everyone has varying experiences on different mattresses. Sleeper comfort and spinal support are the most important factors when it comes to selecting a mattress.

King Koil Mattress CollectionSleep PositionLightweight Sleeper Rating (Less than 130 lbs)Average Weight Sleeper Rating (130 to 230 lbs)Heavyweight Sleeper Rating (More than 230 lbs)
World EditionSideGoodGoodGood
BackGoodVery GoodGood
StomachFairGoodFair
World LuxurySideGoodVery GoodGood
BackVery GoodVery GoodGood
StomachGoodGoodFair
World Extended LifeSideGoodVery GoodGood
BackGoodVery GoodVery Good
StomachPoorGoodGood
World Luxury IntimateSideVery GoodGoodFair
BackVery GoodVery GoodGood
StomachGoodGoodPoor
iMattressSideVery GoodGoodFair
BackVery GoodGoodGood
StomachGoodGoodPoor

For more information on sleeping positions please see our guides for side, back, stomach and combination sleepers.

 

King Koil Company Information

Customer Service: 6 out of 10 owner experiences show customers have had a positive experience with King Koil, irrespective of whether or not they liked their mattress.
BBB rating: A+
Company History: King Koil was founded in 1898. The company was sold to Kaiserkorp Corporation, a Malaysia-based company, in 2015.
Physical Stores: King Koil does not operate any brick-and-mortar company showrooms, but their mattresses are available at retail locations nationwide.
Corporate Address:
7501 S Quincy St
Willowbrook, IL 60527-8427
Phone Number: 1-800-525-8331
Contact Email: Online form
Company Website: https://www.kingkoil.com/
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Sleep Trial and Warranty Information

Trial Period and Guarantee: King Koil does not offer a sleep trial for mattress purchases. Buyers should defer to the sleep trial and return policy of the retail location where they purchase their mattress.

Warranty: King Koil offers variable warranty coverage depending on the selected mattress model.

  1. The following mattresses include a 10-year nonprorated warranty:
    • Siena Firm
    • Sydney Firm
    • Monaco Plush
    • Monaco Euro Top
    • Kingsley Firm
    • Kingsley Plush
    • Kingsley Euro Top
    • Montego Luxury Firm
    • Montego Luxury Plush
    • Montego Luxury Pillow Top
  2. The following mattresses include a 25-year warranty; coverage is divided into 15 years of nonprorated coverage and 10 years of prorated coverage. Prorated charges are not listed.
    • Athens Plush
    • Athens Firm
  3. Warranty coverage length is not disclosed for the following mattresses:
    • Sydney Euro Top
    • Vienna Firm
    • Vienna Plush
    • Vienna Euro Top
    • XS 10 Hybrid Firm
    • XS 50 Hybrid Plush
    • G10 Firm
    • G12 Plush
  4. King Koil will, at their sole discretion, choose to repair or replace all mattresses that are deemed defective. Owners will be responsible for all transportation, labor, and handling charges associated with mattress repairs or replacements, or the cost of replacing a mattress if it occurs during a prorated coverage period (whatever is the cheapest option).
  5. The warranty will cover the following product defects:
    • Visible sagging or indentations that measure a half-inch (1/2″) or deeper in the sleep surface of a mattress with a 25-year warranty; or measure one and a half inches (1 1/2″) or deeper in the sleep surface of a mattress with a 10-year warranty.
    • Mattress coils that are broken or protruding through the fabric.
  6. The warranty will not cover the following:
    • Indentations or sagging that measure less than a half-inch (1/2″) in the sleep surface of a mattress with a 25-year warranty; or less than one and a half inches (1 1/2″) in the sleep surface of a mattress with a 10-year warranty. Additionally, normal increases in mattress softness that do not affect its pressure-relieving abilities. These issues are all considered standard wear and tear.
    • ‘Bent border wires’ that have become misshapen since the mattress was delivered.
    • Repair or replacement requests that occur due to changes in the owner’s height or comfort preferences.
    • Burns, cuts, tears, stains, and other types of physical damage that occur due to owner misuse, improper cleaning, and/or inadequate foundational support.
    • Torn handles, damages sides, and other types of wear that occur due to the mattress being carried after its initial delivery.
  7. Warranty coverage is exclusively extended to original owners who purchase their mattress directly from King Koil or one of the company’s authorized retailers. Those who buy or acquire their mattress from the original owner or an unauthorized retailer will do so as is, and will not be eligible for warranty protection.
 

Similar Mattress Options

Lastly, let’s look at some mattress models that are comparable to King Koil’s current selection. The following mattress brands offer memory foam, innerspring, and/or hybrid mattresses, and some sell their products online and in brick-and-mortar stores. To learn more about these brands, click the links in the ‘Brand’ and ‘Mattress Type’ rows of the table.

BrandIkeaNest BeddingSaatvaTempur-PedicKing Koil
Model(s)14 individual modelsAlexander Signature
Alexander Signature Hybrid
Love & Sleep
Alexander Hybrid Luxury Contour
Hybrid Latex
Q3
Saatva MattressFlex Prima
Flex Supreme
Flex Elite
Flex Supreme Breeze
Cloud Collection
Contour Collection
TEMPUR-Legacy
GrandBed
World Edition Collection
World Luxury Collection
World Extended Life Collection
World Luxury Intimate Collection
iMattress Collection
Mattress TypeInnerspring
Hybrid
Foam/Memory Foam
Latex
Memory foam
Latex
Hybrid
InnerspringMemory foam
Hybrid
Memory foam
Innerspring
Hybrid
Price Range$89 to $1,199$399.00 to $3,999.00$649.00 to $1,399.00$1,299 to $8,599$549 to $3,699
Thickness Range3 7/8″ to 17 3/4″9″ to 13 1/2″11 1/2″ or 14 1/2″10″ to 15″11 1/2″ to 14″
Firmness OptionsMedium
Medium Firm
Firm
Soft
Medium
Medium Firm
Firm
Medium Soft
Medium Firm
Firm
Soft
Medium Soft
Medium
Medium Firm
Firm
Soft
Medium Soft
Medium
Medium Firm
Firm
AvailabilityOnline
In-store
Online
In-store
Online
In-store
Online
In-store
In-store
Sleep Trial365 nights100 nights120 nights90 nightsNone
Warranty Length25 yearsLifetime15 years10 years10 or 25 years
Tuck Customer Satisfaction Rating60% to 77% (3,299 customer reviews)72% to 79% (2,088 customer reviews)76% (1,032 Customer Reviews)71% to 77% (5,179 customer reviews)63% to 66% (598 customer reviews)
 
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