Novaform ComfortGrande Review: Side Sleepers Are the Fit; Stomach Sleepers Should Look Elsewhere

The Novaform ComfortGrande is a sensible match if you want a thick, all-foam mattress with a medium-firm feel and strong contouring; it is a weaker choice if you sleep on your stomach, want a springy surface, or need firm support at a higher body weight. I would shortlist it for side sleepers first, then compare the current Costco price for your exact size before deciding.

If you want the wider picture before deciding, start with our best innerspring mattresses.

Our pick for a different feel

Saatva Classic — choose it if you want coils instead of an all-foam hug.

• 365-night home trial
• Free in-room delivery and setup
• Lifetime warranty
• Free mattress removal with delivery

Check today’s Saatva Classic price →

Is the Novaform ComfortGrande worth buying?

For a side sleeper who likes slow-moving foam, yes: the ComfortGrande has a 14-inch, three-layer gel-memory-foam design and Costco lists a 20-year warranty. Its strongest case is pressure relief and motion absorption, not bounce or a broadly adjustable feel. Sleep Foundation’s hands-on ComfortGrande review found the best fit among side sleepers under 230 pounds and weaker fit for stomach sleepers.

The current Costco listing calls the model the Novaform 14-inch ComfortGrande Advanced Gel Memory Foam Mattress. It describes triple-action cooling, phase-change gel, EVENcor GelMAX memory foam, a quilted cover with cool-to-touch fibers, and a three-layer construction. Those are product features and brand descriptions, not a promise that every hot sleeper will stay cool.

My verdict is simple: buy it for the combination of contouring, a foam feel and Costco’s return framework; look elsewhere if your priority is a buoyant, easy-to-reposition surface or a reliably firm feel. Costco’s live listing displays selectable sizes from Twin through California King. Choose the size before comparing prices, since the purchase decision depends on the current total for the size you actually need.

What is inside the 14-inch ComfortGrande?

Novaform and Costco describe a three-layer, 14-inch foam mattress with gel-related cooling features and a quilted cover. The published page names EVENcor GelMAX memory foam and phase-change gel, but it does not break out every layer’s thickness in the information visible at selection. That means you can compare the broad design confidently without treating unlisted layer measurements as facts.

One sizing detail has changed across sources. Sleep Foundation’s review updated in October 2025 lists no Twin XL option, while Costco’s current product selector now includes Twin XL. For the specific item currently sold, follow the live retailer listing rather than an older size table. Check the item title and firmness selection as well: retailers sometimes group more than one option under a single product page.

The all-foam construction is the key feel decision. Memory foam lets your shoulder and hip settle into the surface, which can reduce the sharp, direct pressure a firm flat surface creates. The trade-off is that the same close contour can make turning feel slower than it does on a mattress with a more responsive coil unit.

How does it feel, and who is it best for?

Sleep Foundation rates the ComfortGrande medium-firm, at 6 on its 1-to-10 scale. Its testers found the most consistent fit for side sleepers under 230 pounds, while stomach sleepers and heavier back sleepers reported more sinkage than they wanted. Use those results as another review team’s experience, not a guarantee of your own comfort.

For side sleeping, the useful question is whether the upper foam eases pressure at the shoulder and hip without letting your middle sink too far. Sleep Foundation’s reviewers gave pressure relief an 8/10 overall and rated side-sleeper fit strongest in the 130-to-230-pound group. Their published results also note that side sleepers above 230 pounds may sink too deeply around the joints. If you sleep on your side and prefer a close, cushioned feel, those findings make the ComfortGrande a credible candidate.

Back sleepers should be more selective. The same Sleep Foundation assessment reported that lighter back sleepers got better support, while its scores fell as tester weight increased. That does not mean every person in a particular weight range will have the same alignment or comfort; it does mean a sleeper who needs a firm, flat surface should not treat the word “support” in a product description as proof that the feel will work for them.

For stomach sleepers, I would choose a firmer model before this one. Sleep Foundation’s testers found the surface too plush for many stomach sleepers, where hip sinkage can make it harder to keep the body level. If you are between positions, consider how much of the night you spend on your stomach and whether you already know you dislike slow-moving foam.

Couples may appreciate one clear foam advantage: motion absorption. Sleep Foundation rated motion isolation 7.5/10 and described the mattress as limiting vibration across the bed, though it also noted some movement can still be felt. If one partner tosses and turns, that is a more relevant data point than a “cooling” label; if you need a springy edge to sit on or frequent position changes, the all-foam design deserves closer scrutiny.

Will the cooling features keep you comfortable?

Novaform includes phase-change gel, GelMAX foam and a cool-to-touch quilted cover; these are design features, not a measured temperature guarantee. Sleep Foundation’s separate testing rated temperature control 7/10 for the ComfortGrande. That is a positive result in its test setting, but it does not establish that the bed will feel cool to every sleeper, bedroom or climate.

Look at your whole sleep setup before paying extra for a cooling claim. A mattress protector, thick sheets, a warm room and your own heat sensitivity can change the result. If you tend to overheat, prioritize a return policy that you understand and use breathable bedding; no single cooling material removes the influence of the rest of the bed.

How do price, Costco returns and the warranty compare?

Costco lists six sizes and a 20-year warranty; price and delivery depend on the selected item. Select a size on Costco’s listing to see its current total and delivery details. Compare like sizes; promotions change. Check the local return route before ordering.

The listing’s 20-year warranty is separate from Costco’s return policy. Costco’s published merchandise policy describes a satisfaction guarantee and explains that online orders can be returned at a warehouse or through Costco.com, subject to limitations and product-specific terms. That general policy is not a 20-year trial. Review the mattress listing’s Shipping & Returns section and the warranty document before ordering, especially if you need pickup or delivery arrangements.

Saatva offers a different buying proposition. On its official Saatva Classic page, Saatva lists a 365-night home trial, free in-room delivery and setup, a lifetime warranty and free mattress removal. Those terms may appeal if you value an at-home trial and service. They do not make the Saatva Classic the right substitute for every ComfortGrande shopper: Saatva uses an innerspring construction, while Novaform is all foam.

Who should buy the ComfortGrande, and who should skip it?

Choose the Novaform ComfortGrande if you sleep on your side, like memory foam that contours around your shoulder and hip, and want an all-foam option sold through Costco. Sleep Foundation’s October 2025 hands-on review rated the feel medium-firm (6/10), pressure relief 8/10 and motion isolation 7.5/10; its strongest fit was side sleepers under 230 pounds, especially those between 130 and 230 pounds. Its test team reported more sinkage for heavier side and back sleepers and a too-plush surface for many stomach sleepers. Costco’s current listing shows Twin, Twin XL, Full, Queen, King and California King sizes and lists a 20-year warranty. Confirm size, price, delivery and product-specific return details on Costco’s listing before ordering. Choose another design if you need a very firm, bouncy surface or strongly dislike foam contouring. These review findings help screen for fit; they cannot guarantee your own comfort.

The ComfortGrande is a better fit for you if:

• You sleep mostly on your side and like a cushioned shoulder-and-hip feel.
• You share a bed and value the motion absorption that foam can provide.
• You want an all-foam mattress with listed cooling features and can verify the exact size and total at Costco.
• You are comfortable reading the retailer’s product-specific return and warranty terms before buying.

Look elsewhere if you sleep mostly on your stomach, prefer a very firm or buoyant surface, or want to move around on the mattress with little resistance. Sleep Foundation’s testing also suggests caution for heavier back sleepers and side sleepers above 230 pounds because its testers experienced more sinkage. Treat that as a useful warning from an independent review team; your position, build and preferences still matter.

Also skip it if you expect “cooling” in the product name to guarantee a cold sleep surface. The retailer lists cooling materials, and Sleep Foundation’s temperature-control score is positive, but the review does not promise that every hot sleeper will be comfortable. If returning a mattress would be difficult, confirm the delivery and return logistics for your ZIP code before you order.

How does Saatva Classic differ from Novaform?

Novaform is all foam; Saatva Classic is an innerspring mattress. That changes the feel more than a marketing label does. Choose ComfortGrande for closer contouring; compare Saatva if you prefer coils and want its published delivery and trial terms. The two builds suit different preferences.

For a fair comparison, pick one size first, then compare the current price and terms for both models. Saatva currently lists two height options and three comfort levels for its Classic; choose the combination that matches your preference before you look at the checkout total. The Queen price and any promotion can change, so use the live listing rather than an old screenshot or a previous review.

The Saatva Classic is not an “upgrade” in every sense. A shopper who wants deep foam contouring may prefer the Novaform’s feel, while a shopper who dislikes sinking into memory foam may prefer an innerspring. Saatva’s trial and delivery package is a real point of difference; it does not erase the gap in construction or make the mattresses interchangeable.

Bottom line: The Novaform ComfortGrande earns a place on a shortlist for side sleepers who like medium-firm memory foam, especially when motion absorption matters. I would not choose it blind if I sleep on my stomach, want a firm and responsive surface, or cannot confirm the return logistics. Check the live Costco listing for the size and delivery terms you need; compare Saatva Classic only if you want an innerspring feel and its trial and delivery service are worth considering.

Frequently asked questions

These quick answers separate product features from independent test findings and return rules. Use the retailer’s current listing for the size, price, stock, delivery and return details that apply to your order before you choose; those details can change. Read the product warranty separately.

Is the Novaform ComfortGrande a medium-firm mattress?

Sleep Foundation’s ComfortGrande review classifies the feel as medium-firm, or 6/10 on its scale. Costco’s current listing has product options; check the selected item and description before ordering rather than assuming every listing variation is identical.

Does Costco sell the ComfortGrande in Twin XL?

Costco’s current size selector shows Twin XL alongside Twin, Full, Queen, King and California King. Sleep Foundation’s older October 2025 review said Twin XL was not available, so rely on the live Costco selector for current availability.

Does the Novaform ComfortGrande come with a 20-year return period?

No. Costco lists a 20-year warranty, which is different from a return period. Costco’s general satisfaction policy and the product-specific return details govern returns; check both before purchase.

Is ComfortGrande good for side sleepers?

Sleep Foundation’s hands-on review found its strongest fit among side sleepers under 230 pounds and reported higher pressure-relief scores. The feel is personal, so use that as review evidence rather than a promise about how your body will respond.

Is it good for stomach sleepers?

Sleep Foundation’s testers found the mattress too plush for many stomach sleepers, with more sinkage than they wanted. If you prefer a level, firm surface, compare firmer options before choosing this foam design.

Is the Novaform ComfortGrande actually cooling?

Costco lists phase-change gel, GelMAX foam and a quilted cover with cool-to-touch fibers. Sleep Foundation rated temperature control 7/10 in its review. These features may help, but they do not guarantee the same temperature experience for every person.

How does it compare with Saatva Classic?

ComfortGrande is a three-layer all-foam mattress; Saatva Classic is an innerspring mattress. Saatva lists a 365-night home trial, free in-room delivery and setup, and a lifetime warranty. Compare the current price at the same size if you prefer coils and want those services.

Reviewed by the World Sleep Almanac editorial team — updated October 2, 2026.