An editorial review of the Novaform ComfortGrande sold at Costco - pressure relief, cooling, edge support, the 2023 mold recall, and how it stacks up against Nectar, Helix, and Saatva for budget shoppers.
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The Novaform ComfortGrande is a 14-inch all-foam mattress sold almost exclusively through Costco. It pairs gel-infused memory foam with a thick polyfoam support core at a price most direct-to-consumer brands can't match - Queen sizes typically land around $580, well under half what comparable memory-foam beds cost from premium brands (NapLab).
In recent independent testing, the ComfortGrande has earned mixed-but-reasonable scores: Mattress Clarity rates it 4.1/5 with a medium-firm 7/10 firmness, while Sleep Foundation scores it 7.9/10 and calls out strong motion isolation and pressure relief for side sleepers. NapLab's lab benchmark places performance in the bottom 7% of mattresses they've tested, so expectations matter.
This review covers who the Novaform ComfortGrande is right for in 2026, where its weak spots show up, and how it compares to the alternatives Costco shoppers usually cross-shop.
Important - 2023 mold recall: Costco recalled roughly 47,000 Novaform mattresses in September 2023 after mold was found between the cover and foam in mattresses returned to stores. Current production is unaffected, but if you bought a ComfortGrande between 2018 and 2023, check Costco's recall notice (CNET).
If a Costco run is already part of your routine and you're shopping under $700, the ComfortGrande makes a strong case - especially for these sleepers:
Costco's pricing on Novaform shifts with seasonal promotions and member discounts; the table below reflects typical recent listings. Always check Costco for current pricing.
Free shipping in the contiguous US is standard. Costco members get the brand's full warranty plus Costco's signature return window.
Mattress Clarity rates the ComfortGrande a 7/10 on its 1-to-10 firmness scale - "just slightly firmer than your average medium-firm bed" - based on the reviewer feeling shoulder and hip pressure on her side but adequate support on her back and stomach. The bed delivers a "balanced foam feel" rather than the slow-moving sink of traditional memory foam: the foam springs back faster than classic memory foam but is not as bouncy as a hybrid. Plan on a 7-to-14-day break-in.
Pressure relief on side and back is where the ComfortGrande earns its keep. The thick 3-inch gel-infused memory foam pad disperses load across shoulders and hips for sleepers in the 130-230 lb range. Lighter sleepers may sit higher on the surface and miss some of the contouring; heavier sleepers may bottom out on the polyfoam core. Mattress Clarity's 4/5 support score reflects this split - their average-weight tester reported "really comfortable" cushioning on the back and "well supported" hips on the stomach, but felt "a little bit of pressure" on the shoulder and hip when side-sleeping, consistent with the 7/10 firmness reading.
Strong. Memory foam's slow response naturally absorbs movement, and the 14-inch profile of the ComfortGrande adds enough mass that bed-exits and tossing rarely transmit to the other side.
Mixed. Gel beads and channel foam help, but no all-foam mattress competes with a coil-supported hybrid for airflow. If you sleep hot year-round, look at Costco's hybrid options or step up to a brand like Helix or Saatva. If "warm but not unbearable" is acceptable, the ComfortGrande does fine.
Below average. The thick all-foam profile collapses noticeably at the perimeter when you sit on the edge to put on shoes or sleep close to the side. Mattress Clarity rates edge support 3/5: their reviewer could comfortably "bend over and tie my shoes" while sitting on the side, but lying along the edge felt unstable - "I didn't feel like I could have stayed there for long before rolling off the bed." Couples who use the full surface area may notice it; solo sleepers in a Queen or larger usually don't.
Expect a noticeable initial smell when you cut the plastic. The mattress is CertiPUR-US certified, so VOC content is within third-party limits. Mattress Clarity's reviewer described the unboxing smell as "strong enough for me to notice" but not bothersome, and reports the chemical odor "is usually gone after 24 hours, but it can sometimes take up to 48." Air the bedroom and the smell typically clears within a day or two rather than a week.
The ComfortGrande is an all-foam stack:
This stack is conservative - no zoned coils, no latex, no airflow grids. It's what makes the bed cheap, and also what caps its top-end performance.
If you're cross-shopping, three alternatives come up most often in 2026:
For most people prioritizing budget and short-list shopping, the ComfortGrande beats the Costco hybrid alternatives for pressure relief but loses to them on cooling and edge support. Match the trade-off to your sleep style.
Costco recalled approximately 47,000 Novaform mattresses in September 2023 after mold was found between the cover and foam in mattresses returned to stores. Current production is unaffected. If you bought a ComfortGrande between 2018 and 2023, check Costco's recall notice and contact your local warehouse for guidance.
It depends on priority. Casper offers more polished home-trial logistics and direct customer support, plus models with hybrid construction for cooling. Novaform almost always wins on price thanks to Costco's warehouse-club model. For value-first shopping, Novaform is the better pick; for white-glove service and a 100-night home trial, Casper.
Sealy is a much broader brand sold across most retail channels with hybrid and innerspring options at every price tier - better if you want coil-based support or store-floor try-before-you-buy. Novaform is narrower (mostly all-foam, mostly Costco) and competes on pressure relief and price. Side sleepers usually prefer Novaform; hot sleepers and edge sleepers usually prefer a Sealy hybrid.
It sleeps warmer than a hybrid but cooler than a basic memory-foam bed. Gel infusion and channel foam help, but no all-foam mattress matches a coil-supported hybrid for airflow. If you regularly wake up sweating, a hybrid is a safer bet.
Most reviewers report a 7-14 day break-in. Off-gassing fades within 3-7 days in a ventilated room. The foams settle into their advertised feel after roughly two weeks of regular use.
For average-weight back and side sleepers, the medium-firm feel and 3-inch gel memory foam comfort layer support neutral spinal alignment and relieve hip/shoulder pressure. Sleepers over 230 lbs or those who need a firm push-back may do better on a hybrid with zoned support.
Written by
Banner Mattress EditorialThe Banner Mattress editorial team publishes independent mattress reviews, buying guides, and sleep-health advice. Since 2018 we've tested 1,000+ mattresses and 3,000+ pillows, sheets, and bedding accessories in our review lab - every recommendation is hands-on, never sourced from vendor talking points. Affiliate links may earn us a commission, but never change what we recommend.
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