Novaform ComfortGrande Plus Mattress Review (2026): Costco Foam

Novaform ComfortGrande Plus Mattress Review (2026)

This review focuses on the Costco-sold Novaform ComfortGrande Plus. We compare the listed construction, manufacturer descriptions and commonly reported feel, while distinguishing those sources from Yawnder’s own testing. Yawnder has not published instrumented cooling, motion-transfer or pressure-map results for this exact ComfortGrande Plus generation. Comfort is subjective, so check the model label and the feel in your preferred sleep position before buying.

A Closer Look at the Novaform ComfortGrande Plus

Before we dive into feel and performance, let’s establish what this mattress actually is. The Novaform ComfortGrande Plus is a 14-inch, all-foam mattress sold primarily at Costco. Its height is one of its key selling points, giving it a substantial, luxurious appearance that many associate with higher-end models. Like most modern foam mattresses, it arrives compressed and rolled in a box. The construction consists of three distinct foam layers, each serving a specific purpose.

The layers are generally structured as follows:

• Top Comfort Layer: This is the layer you feel first. It’s made of 3 inches of gel-infused memory foam. The goal here is twofold: to provide that classic memory foam contouring and pressure relief, while the gel infusion aims to mitigate memory foam’s notorious tendency to trap heat.
• Middle Transition Layer: Below the soft top layer sits 3 inches of firmer, more responsive foam. This layer acts as a transition, preventing you from sinking straight through the comfort layer and hitting the hard base. It adds support and helps with spinal alignment.
• Base Support Layer: The foundation of the mattress is an 8-inch layer of high-density polyfoam. This provides the core structural support for the entire bed and is crucial for durability and preventing premature sagging.

The mattress cover is a soft, quilted textile that is breathable but typically not removable for washing. It’s important to note that all foams used are CertiPUR-US certified, meaning they are made without harmful chemicals like ozone depleters, heavy metals, and formaldehyde, and have low VOC (Volatile Organic Compound) emissions for indoor air quality.

Deconstructing the Comfort: Feel and Firmness

Costco describes the ComfortGrande Plus as a Medium gel-memory-foam mattress. Some reviewers describe its perceived feel as medium-firm, but we have not published a calibrated Yawnder firmness score for this exact generation. Firmness perception depends on sleeper weight, sleeping position and the underlying support surface.

For Side Sleepers

Side sleepers require significant pressure relief at their hips and shoulders to maintain proper spinal alignment. Average-weight side sleepers (around 130-230 lbs) will likely find the 3-inch top layer offers adequate cushioning for these pressure points. The foam contours nicely to the body’s curves. However, lightweight side sleepers (under 130 lbs) may not sink in enough to experience this full pressure-relieving benefit, potentially finding the mattress a bit too firm. Heavyweight side sleepers (over 230 lbs) may sink through the top comfort layer and feel more of the firmer transition foam, which could cause some pressure buildup.

For Back and Stomach Sleepers

Back sleepers are often a great match for this mattress. The medium-firm feel provides a good balance of support to keep the hips from sinking too low, combined with enough cushioning for lumbar comfort. It promotes a healthy spinal posture for most back sleepers of average weight. Strict stomach sleepers, however, should be more cautious. This position requires a very firm, supportive surface to prevent the hips from dipping, which can lead to lower back strain. While some lighter stomach sleepers might find the Novaform adequate, many will find it too soft for their needs.

For Combination Sleepers

If you change positions throughout the night, ease of movement is key. The Novaform Comfort Grande Plus, being a traditional memory foam mattress, has a slow response time. You get that “in the mattress” feel rather than an “on the mattress” feel. This means changing positions can require a bit more effort compared to a hybrid or latex mattress. It’s not a deal-breaker for most, but if you’re a particularly restless sleeper, you might feel slightly ‘stuck’ at times.

Performance Under Pressure: Key Metrics

Beyond the initial feel, a mattress’s performance in key areas determines its long-term value and your satisfaction.

Many owners praise the mattress for its excellent pressure relief and minimal motion transfer, a huge plus for couples. However, a common critique involves heat retention, with some users reporting that it sleeps warmer than they’d prefer, despite the gel-infused foam.

Motion Isolation

This is a standout strength for the Novaform. The deep layers of memory foam do an exceptional job of absorbing movement. When your partner tosses, turns, or gets out of bed, you are unlikely to feel much of it on your side. This makes it an excellent choice for couples, especially those who are light sleepers easily disturbed by motion.

Temperature Regulation

Gel-infused foam and the cover are marketed for cooling, but a cool-to-touch sensation is not proof of all-night temperature regulation. This is an all-foam construction; individual sleepers can still experience heat retention. No instrumented overnight cooling result from Yawnder is presented for this older ComfortGrande Plus.

Edge Support

Edge support refers to the stability of the mattress perimeter. The Comfort Grande Plus performs adequately in this area but doesn’t excel. When you lie near the edge, you’ll feel reasonably secure. However, when you sit on the edge to tie your shoes or get ready, you’ll notice a significant amount of compression. This is a common trade-off with all-foam, bed-in-a-box mattresses. If you rely heavily on the edge of your bed for seating or have mobility issues, this could be a drawback.

The Costco Factor: Price, Warranty, and Returns

Costco has a broad merchandise satisfaction guarantee, with its published exceptions and order-specific conditions. The Costco return policy and Costco.com return options explain the applicable process; this is not a separate manufacturer-promised 365-night trial. Confirm any pickup arrangements, return eligibility and refund details for your exact purchase, especially before assuming a mattress can be returned after extended use.

However, the logistical reality of returning a mattress that has expanded from a box to a 14-inch queen or king can be daunting. It’s not a simple process and requires significant effort. This hassle factor is something to consider seriously before relying on the return policy as a casual trial period.

Ultimately, the Novaform Comfort Grande Plus provides solid value and good performance, especially in motion isolation and pressure relief for back and average-weight side sleepers. Its weaknesses lie in areas common to many all-foam beds: so-so edge support, potential heat retention for hot sleepers, and a slow response time for combination sleepers. While Costco’s return policy is a fantastic perk, nothing beats the confidence of knowing a mattress is right for you before you commit. Understanding how a mattress feels for your unique body and sleep preferences is the most critical step in this journey, and it’s a step that can’t be replicated by reading online reviews. For a truly personalized experience where you can compare different materials and firmness levels with expert guidance, we invite you to visit our San Diego showroom at 1441 Encinitas Blvd, Encinitas CA, and find the perfect mattress with zero guesswork.