King Koil Mattress Review

Last updated on

Based on 509 verified customer experiences from 7 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 18 different mattress models are currently listed on the company’s website.
  • The following three innerspring mattress models are currently available as part of the World Edition collection:
    • 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 memory foam comfort layer. The support core features pocketed coils over a polyfoam base layer, and the quilted cover is 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 innerspring/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 mattresses are sold as innerspring/hybrids as part of the World Extended Life collection:
    • The Athens Firm has a comfort system with layers of Talalay latex and 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 layers of Talalay latex and memory foam in the comfort system, as well as a pocketed coil support core encased in foam. The fabric cover is infused with high-density foam.
  • These three innerspring/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 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 10 Hybrid Plush features a memory foam comfort layer, a pocketed coil support core, and a fabric cover infused with copper yarns.
    • 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.

Pros:

  • King Koil offers 18 different innerspring/hybrid and memory foam mattress models in a wide range of firmness settings in order to accommodate a large pool of mattress shoppers.
  • Customers report that King Koil innerspring/hybrids retain little body heat (allowing them to sleep cool), offer strong edge support, and have a responsive surface that is suitable for sex.
  • King Koil memory foam mattresses offer above-average motion isolation and produce virtually no noise.
  • King Koil mattresses are available at brick-and-mortar locations across the country, as well as online through the company’s site.
  • The G10 Firm and G12 Plush mattresses have average to below-average price-points compared to other memory foam models. 

Cons:

  • Chief complaints about the mattress include below-average durability and minimal motion isolation.
  • Customer complaints about memory foam models include below-average durability, high heat retention, and poor edge support.
  • Most King Koil innerspring/hybrid mattresses have an above-average price-point compared to other similar models.
  • King Koil does not disclose some details about their mattresses — including size and weight specs, delivery policies, or trial period information — which may make it difficult for potential customers to effectively research the company.  

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 next section. All King Koil mattresses are manufactured in the United States.

Customer Satisfaction Rating: 64 to 65 (varies by mattress type)
Calculated from: 509 customer experiences from 7 individual sources
Amazon rating: King Koil mattresses are not available for purchase on Amazon.com
BBB rating: A+

 

King Koil Innerspring Price Comparison

King Koil Innerspring Pricing and Delivery Details

SizeDimensions Height Availability Notes
Twin39W” x 75L”11 1/2″ to 12″ (World Edition)
13″ to 14 1/2″ (World Luxury)
13 1/2″ (World Extended Life)
Not available for the Athens Firm, Athens Plush, Vienna Plush, Vienna Firm, Vienna Euro Top
Twin Extra Long (XL)39W” x 80L”11 1/2″ to 12″ (World Edition)
13″ to 14 1/2″ (World Luxury)
13 1/2″ (World Extended Life)
Not available for the Athens Firm, Athens Plush, Vienna Plush, Vienna Firm, Vienna Euro Top
Full54W” x 75L”11 1/2″ to 12″ (World Edition)
13″ to 14 1/2″ (World Luxury)
13 1/2″ (World Extended Life)
Not available for the Athens Firm, Athens Plush, Vienna Plush, Vienna Firm, Vienna Euro Top
Queen60W” x 80L”11 1/2″ to 12″ (World Edition)
13″ to 14 1/2″ (World Luxury)
13 1/2″ (World Extended Life)
King76W” x 80L”11 1/2″ to 12″ (World Edition)
13″ to 14 1/2″ (World Luxury)
13 1/2″ (World Extended Life)
California King72W” x 84L”11 1/2″ to 12″ (World Edition)
13″ to 14 1/2″ (World Luxury)
13 1/2″ (World Extended Life)
Not available for the Vienna Plush, Vienna Firm, Vienna Euro Top, G10 Firm, G10 Plush, XS 10 Hybrid Firm, XS 50 Hybrid Plush

The next table looks at current price rates for all King Koil mattresses.

ModelTwinTwin XLFullQueen KingCali King
Siena Firm$549$599$599$699$799$799
Sydney Firm$749$799$799$899$1,099$1,099
Sydney Euro Top$849$899$899$999$1,199$1,199
Kingsley 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
Athens FirmN/AN/AN/A$1,999$2,399$2,399
Athens PlushN/AN/AN/A$1,999$2,399$2,399
Vienna PlushN/AN/AN/A$2,899N/A$3,199
Vienna FirmN/AN/AN/A$2,899N/A$3,199
Vienna Euro TopN/AN/AN/A$3,199N/A$3,399
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
G10 Firm$599$849$699$849$1,049N/A
G12 Plush$699$799$799$949$1,149N/A

How Is the Mattress Shipped?: Innerspring/hybrids and memory foam mattresses from King Koil are shipped in a box. Some models may be compressed and rolled up for shipping.
Where Do They Ship?: King Koil ships mattresses anywhere in the United States, including Alaska and Hawaii.
Delivery Fee: No charge for standard front-door delivery; White Glove delivery service is available for $99.

Delivery Policy: The delivery policy for King Koil is as follows:

  1. King Koil utilizes UPS for all standard deliveries.
  2. The company’s White Glove delivery service includes in-home assembly, packaging waste disposal, and — upon request — old mattress removal.

Old Mattress Removal: Old mattress removal is available as part of the White Glove delivery option; this service is not offered for standard delivery.
Availability: King Koil mattresses are available for purchase on the King Koil website, as well as select brick-and-mortar retailers across the country (primarily on the East Coast).

 

King Koil Product Specifications and Firmness

The firmness rating of a King Koil mattress will vary by selected model. A detailed breakdown of components and dimensions for each King Koil mattress is found in the table below. Please note that mattress heights, layer measurements, and cover composition specs are not available for mattresses in the World Luxury Intimate and iMattress collections. Additionally, King Koil does not disclose the density of any foams used in their mattresses.

Mattress CollectionProduct NameFirmness RatingThicknessSupport 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 Firm)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″ Memory Foam1 1/2″Quilted Fabric Infused with Gel Foam
World LuxuryKingsley Firm5.5 (Medium Firm)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)14 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 Firm)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 Firm)13 1/2″8″ Pocketed Coils (1,022 Coil Count)
1 1/2″ Base Polyfoam
1″ Memory Foam
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
N/A
Vienna Firm5.5 (Medium Firm)N/APocketed Coils
Base Polyfoam
Joma Wool
Gel Memory Foam
Latex
Memory Foam
N/A
Vienna Euro Top4 (Medium Soft)N/APocketed Coils
Base Polyfoam
Joma Wool
Gel Memory Foam
Latex
Memory Foam
Microcoils
N/A
iMattressXS 10 Hybrid Firm5.5 (Medium Firm)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
G10 Firm5.5 (Medium Firm)N/AHD PolyfoamMemory FoamFabric Infused with Copper Yarns
G10 Plush4 (Medium Soft)N/AHD PolyfoamMemory 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.

 

Sleep Trial and Warranty Information

Trial Period and Guarantee: King Koil does not list information about mattress trial periods on their website; we have reached out to the company, and will provide details if and when they become available. Customers who purchase their mattress from an authorized King Koil retailer should defer to the sleep trial and return policy of the brick-and-mortar 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
    • 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. In the event of a replacement for a mattress that has been discontinued, King Koil will replace the original model with a comparable substitute.
  6. 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.
  7. 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.
  8. 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.
 

King Koil Innerspring Mattress Sleep Ratings

 

CategoryCriteriaKing Koil Innerspring/Hybrid RatingKing Koil Memory Foam RatingWhat King Koil Users Say
Customer SatisfactionBased on data collection, this is an overall customer sentiment regarding King Koil innerspring/hybrid and memory foam mattresses.6564The customer satisfaction rating for King Koil matches the average rating for all innerspring mattress sellers, while the company’s memory foam mattresses earned a below-average rating compared to similar models.
Durability The average mattress will perform for approximately seven years before it needs to be replaced.FairFairCustomers claim King Koil’s innerspring and memory foam mattresses have a lifespan of six to seven years, which is comparable to the average for these mattress types.
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 effectively minimize and isolate motion, which can cut down on nighttime disruptions.PoorVery GoodAlthough results vary by selected model, most King Koil innerspring/hybrids are fairly responsive and will not minimize or isolate much motion. King Koil memory foam mattresses, on the other hand, isolate motion to a significant extent.
Sex Bouncier, more responsive beds (such as innersprings and hybrids) tend to be more enjoyable for sex than foam-based mattress models.GoodFairCustomers report that most King Koil mattresses have a bouncy, responsive surface that is suitable for sex. The G10 Firm and G12 Plush did not score as high, which is to be expected with memory foam models.
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.FairGoodInnersprings from King Koil offer moderate pressure relief, but customers claim the memory foam mattresses conform closely and alleviate pressure to a higher degree.
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 often sleep hot.GoodFairReports indicate that King Koil innersprings retain a low amount of body heat and sleep relatively cool as a result, while memory foam models sleep somewhat warm by comparison
Off-gassingSome mattresses emit particles when they are unpackaged, accompanied by unpleasant ‘off-gassing’ smells that can last for days.Very GoodFairKing Koil innerspring owners report little to no off-gassing, but the memory foam models have been known to produce some odor.
Edge SupportThe frames of innerspring 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 where people usually sit.Very GoodPoorInnersprings from King Koil feature foam encasements around the pocketed coil support cores, which provide robust edge support and minimize sinkage in the top surface. Comparatively, the memory foam beds offer little to no edge support.
NoiseInnerspring mattresses tend to be somewhat noisy due to their high levels of bounciness and responsiveness, as well as squeaky metal components; most foam mattresses produce little to no noise.FairExcellentMost King Koil owners report that their mattress produce some noise, which is to be expected of innersprings; the memory foam models are virtually silent.
Ease of Moving and RotatingMost innerspring mattresses are relatively heavy, but some can be more unwieldy than others. Foam mattresses tend to be lighter by comparison.FairGoodEase of moving and rotating a King Koil mattress will vary by selected model; the foam models are lighter than the innersprings, as is to be expected.
 

King Koil Innerspring Customer Satisfaction Rating Comparison

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. 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.

Mattress TypeSleep PositionLightweight Sleeper Rating (Less than 130 lbs)Average Weight Sleeper Rating (130 to 230 lbs)Heavyweight Sleeper Rating (More than 230 lbs)
Innerspring/HybridSideGoodGoodFair
BackGoodGoodFair
StomachFairGoodFair
Memory FoamSideGoodGoodFair
BackVery GoodVery GoodGood
StomachFairFairFair

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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Complaints

General customer complaints about King Koil mattresses include:

  • Performance issues with innerspring/hybrids, such as poor motion isolation and below-average durability.
  • Performance issues with memory foam mattresses, including high heat retention/sleeping hot and poor edge support.
  • Above-average price-point for most models.
  • Lack of available information regarding some mattress specifications, delivery policies, mattress trial periods, and other details that customers can use for compare-shopping.
 
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