Meet Our Testing Team

Brad

Keith

Jeremy

Jackson
General Overview
Pros
- Sleep Science offers a dozen different memory foam and latex mattresses with varying firmness ratings to accommodate a wide range of sleeper preferences.
- According to our customer reports, Sleep Science mattresses offer effective motion isolation, produce little noise, and conform closely to sleeper’s bodies and alleviate a good deal of pressure.
- Sleep Science mattresses are available at Costco, which operates a total of 727 brick-and-mortar stores located throughout the United States.
- Costco allows members to return any item (including mattresses) at any time for a full refund, provided the item is in satisfactory condition; this negates the need for a traditional sleep trial.
- The price-points of most Sleep Science mattresses are below-average compared to similar models when an adjustable base is not included in the total cost.
Cons
- Sleep Science owners cite some performance issues, including above-average off-gassing, weak edge support, minimal responsiveness for sex, and ‘sleeping hot’.
- Most Sleep Science mattresses are available in (at most) two to three sizes that do not require customers to also purchase an adjustable bed base; in some cases, the base component more than doubles the overall cost.
- The minimum delivery time for a Sleep Science mattress is seven to 10 business days; at most, these models require two to four weeks for delivery. By comparison, most mattress manufacturers will ship any model to a customer within five to seven business days at most.
Sleep Science mattresses are sold exclusively at Costco.
If you'd rather shop online, read our recommendations and top picks.
Shop Online MattressesWhat Type of Sleeper is Best Suited to a Sleep Science Mattress?
Based on our customer feedback, Sleep Science memory foam and latex 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.
For more information on sleeping positions please see our guides for side, back, stomach and combination sleepers.
Compare Mattresses
Buying online is easier – check out similar mattresses to the Sleep Science mattress line.
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Mattress Technical Details
What You Need to Know About Sleep Science Mattresses
Construction and Firmness
The firmness rating of a Sleep Science mattress will vary by selected model. The table below features details about the components and dimensions of all 12 current Sleep Science mattress models.
Please note that certain specs are not available for select models (such as foam density and/or cover composition).
Firmness is rated on a scale of 1 to 10. For more information on how firmness is calculated, please visit our Mattress Firmness page.
Product Name | Firmness Rating | Thickness | Support Core Components | Comfort Layer Components | Cover Components |
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Dream | 3.5 (Soft) | 8″ | 3″ Polyfoam | 3″ Memory Foam 2″ ‘Air Comfort’ Polyfoam |
Bamboo Fabric Blend |
Latex GL | 3.5 (Soft) | 9″ | 5″ Soy-Infused Polyfoam | 1″ Talalay Latex (21 ILD) 1″ Talalay Latex (19 ILD) 2″ Talalay Latex (24 ILD) |
Not Disclosed |
Natural Latex | 5 (Medium) | 9″ | 6″ Talalay Latex (32 ILD) | 3″ Talalay Latex (19 ILD) | 61% Polyester 37% Organic Cotton 2% Spandex |
Active Latex | 6.5 (Medium Firm) | 10″ | 7″ Open-Cell Polyfoam | 1 1/2″ Dunlop Latex (Soft) 1 1/2″ Dunlop Latex (Medium) |
Not Disclosed |
Active Studio | 4 (Medium Soft) | 10″ | 7″ Polyfoam | 1 1/2″ 4 PCF Memory Foam 1 1/2″ 3 PCF Memory Foam |
Not Disclosed |
Marina | 3.5 (Soft) | 10″ | 5″ Polyfoam | 3″ 3 PCF Gel Memory Foam 2″ ‘Air Comfort’ Polyfoam |
Not Disclosed |
Sleep Science | 5 (Medium) | 10″ | 5″ Polyfoam | 3″ Memory Foam 2″ Polyfoam |
Not Disclosed |
Black Diamond | 6.5 (Medium Firm) | 11″ | 7″ Polyfoam | 1″ 5 PCF Charcoal Bamboo Memory Foam 1″ Memory Foam 2″ Latex |
Not Disclosed |
Carina | 5 (Medium) | 11″ | 6″ ‘Air Channel’ Polyfoam | 2″ 3 PCF Gel Memory Foam 2″ 4 PCF Memory Foam 1″ Latex |
Not Disclosed |
Active Loft | 4 (Medium Soft) | 12″ | 8″ Open-Cell Polyfoam | 2″ 4 PCF Memory Foam (2 Layers) | Not Disclosed |
iFlip Sonoma (Reversible) | 4 (Medium Soft) | 12″ | 4″ ‘Air Channel Polyfoam | 2″ 3 PCF Memory Foam (10 ILD) 2″ ‘Air Comfort’ Polyfoam |
Not Disclosed |
6.5 (Medium Firm) | 2″ 3 PCF Memory Foam (13 ILD) 2″ ‘Air Comfort’ Polyfoam |
Not Disclosed | |||
Ara | 4 (Medium Soft) | 13″ | 6″ ‘Air Channel’ Polyfoam | 3″ 5 PCF Memory Foam 3 5/8″ 5 PCF Memory Foam 3/8″ ‘Air Comfort’ Polyfoam |
Not Disclosed |
Availability
Sleep Science mattresses are exclusively available on Costco.com and in Costco’s brick-and-mortar stores. A nationwide store database is available online.
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Sleep Trial Costco full refund return
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Shipping All 50 states and Puerto Rico
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Warranty 20-year
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Made In USA
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How is the Mattress Shipped?
Sleep Science mattresses are compressed, rolled up, and shipped in a box.
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Where Do They Ship?
Sleep Science ships mattresses anywhere in the continental United States, as well as most addresses in Alaska, Hawaii, and Puerto Rico. A list of restricted delivery areas in Alaska, Hawaii, and Puerto Rico is available on Costco.com.
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White Glove Delivery?
Yes, offered free of charge for select models.
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Full Shipping Details
Delivery Fee: Standard shipping within the continental U.S. is free; deliveries to Alaska, Hawaii, or Puerto Rico will incur additional shipping charges. White Glove delivery is offered free of charge for select models; old mattress removal and disposal will incur a separate charge of $85.
Delivery Policy: The delivery policy for Sleep Science is as follows:
- Sleep Science deliveries are coordinated through FedEx. The expected wait time varies by model. Some models typically ship within seven to 10 business days; others take up to two to four weeks.
- White Glove delivery includes in-home assembly and packaging waste removal; for an additional $85 fee, White Glove personnel will remove the customer’s old mattress and transport it to either a donation center or a recycling facility.
- Although Costco ships some mattresses to Alaska, Hawaii, and Puerto Rico, select Sleep Science models will only be shipped to one or two of these locations. Delivery surcharges for Alaska, Hawaii, and Puerto will be assessed during checkout.
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Old Mattress Removal
Old mattress removal is offered for a fee of $85 with White Glove delivery; this service is not available with standard deliveries.
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Trial Period and Guarantee
Trial Period and Guarantee: Costco does not offer a sleep trial for any Sleep Science mattresses at this time. However, Costco will accept returns from any item purchased online or in a brick-and-mortar store in exchange for a full refund. Customers may drop off their mattress at a brick-and-mortar location; alternatively, they can coordinate their return online. Please note that Costco requires all customers to obtain annual membership before purchasing anything online or in a store; annual membership fees range from $60 to $120.
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Warranty Details
Warranty: Sleep Science offers a 20-year warranty for all current mattresses.
- Sleep Science does not indicate if the warranty is entirely nonprorated or divided into nonprorated and prorated periods. We have reached out to Sleep Science, and will update this section as soon as we receive this information.
- Sleep Science will, at their sole option, repair or replace any mattress that is deemed as defective for as long as the warranty is valid. Owners are responsible for all transportation and handling costs associated with mattress repairs or returns.
- Sleep Science mattresses are designed for use with certain types of foundational support. According to Sleep Science, improper support includes any ‘frame, bed rails or foundation without center support rails, and a solid, continuous surface’. Use of inadequate foundational support will void the warranty.
- If a defective mattress has been discontinued or is not in stock, Sleep Science reserves the right to replace it with another model of comparable quality and value.
- The mattress cover is protected under a separate two-year warranty.
- The warranty will cover the following mattress defects:
- Visible sagging or indentations in the mattress surface measuring three-quarters of an inch (3/4″) or deeper.
- Physical flaws in the mattress that cause the foam or latex to split or crack.
- The warranty will not cover the following:
- Normal increases in mattress softness that do not affect its pressure-relieving abilities, or visible sagging or indentations in the mattress surface that do not three-quarters of an inch (3/4″) or deeper. These issues are considered normal wear and tear.
- Burns, cuts, tears, stains, and other types of physical damage resulting from owner misuse, improper cleaning, and/or inadequate foundational support.
- This warranty exclusively extends to original owners who purchase their Sleep Science mattress directly from Costco or any other authorized retailer. Anyone who buys or acquires their mattress from the original owner or a non-authorized retailer will not receive warranty protection.
Company Information
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Customer Service
7 out of 10 owner experiences show customers have had a positive experience with Sleep Science, irrespective of whether or not they liked their mattress.
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BBB Rating
Sleep Science has not earned a grade from the Better Business Bureau; its parent company, South Bay International, has an A+ rating from the BBB.
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Company History
South Bay International was founded in 1993.
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Physical Stores
Costco operates brick-and-mortar locations across the United States; a full store database is available online.
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Contact Sleep Science
Corporate Address:
South Bay International, Inc.
2665 Pomona Boulevard
Pomona, CA 91768-3221
Phone Number: 1-800-723-0316 (Available Monday through Friday from 8am to 430pm PST)
Contact Email: [email protected]
Company Website: mysleepscience.com