Sijo FlexCool Memory Foam Pillow Review (2026)

Are you tired of waking up in a pool of sweat because your pillow turns into a heat trap? The Sijo FlexCool Shredded Memory Foam Pillow promises to fix that with advanced cooling technology and customizable comfort.

This award-winning pillow features a proprietary blend of 90% shredded memory foam and 10% microfiber, wrapped in a cooling nylon cover with a 0.4 Q-Max score for instant cool-to-touch sensation. It won the Good Housekeeping 2025 Bedding Awards, which caught my attention.

I tested this adjustable pillow for several nights across different sleep positions. My goal was to see if the cooling claims hold up and whether the adjustable loft actually makes a difference.

The verdict? It delivers on cooling better than most memory foam pillows I’ve tried. But there are a few things worth knowing before you buy.

What I Liked

Instant Cool-to-Touch Sensation

The cooling fabric on this Sijo FlexCool pillow is seriously impressive. The outer shell features a high-tech cooling nylon with a 0.4 Q-Max score, which means it feels cool the moment you lay your head down. Unlike some cooling pillows that only feel cool for a few minutes, this one maintains that temperature throughout the night thanks to a phase-change lining underneath.

I found myself reaching for this pillow specifically because of that silky, cool feeling. It’s noticeably cooler than block memory foam pillows, which tend to trap heat.

Fully Adjustable Loft and Firmness

One of the standout features is the adjustable fill system. The pillow comes with extra shredded memory foam that you can add or remove to customize the height and firmness. This solves a common problem with memory foam pillows: they’re usually one-size-fits-all.

I removed a handful of fill to dial in my preferred loft and immediately noticed better neck support. Whether you’re a side sleeper, back sleeper, or stomach sleeper, you can adjust this pillow to your exact preference.

Comfortable Support for All Sleep Positions

After testing for several nights, I had zero neck or back issues. The shredded memory foam provides enough support to cradle your head without sinking in too much. It strikes a good balance between soft and supportive.

The adjustability makes this work for all sleep positions. Side sleepers can add more fill for extra height, while stomach sleepers can remove some for a flatter profile.

Quality Materials and Construction

Sijo uses CertiPUR-US certified and Oeko-Tex certified memory foam, which means it’s free from harmful chemicals. They use freshly manufactured foam cut uniformly, not recycled scraps. The GRS certified recycled polyester between the foam pieces adds to the cloud-like feel while improving breathability.

Machine Washable Outer Cover

The outer cooling nylon cover is machine washable, which makes maintenance easy. You can throw it in on a cold, gentle cycle and tumble dry on low. This is a nice touch for keeping your bedding fresh.

What Needs Improvement

Cover May Shrink in Wash

During testing by Good Housekeeping labs, the cooling nylon cover showed some shrinkage after washing. While this isn’t a dealbreaker, it’s worth following the care instructions carefully: machine wash on cold with a gentle cycle and tumble dry on low. Avoid high heat settings to minimize this issue.

Initial Off-Gassing Odor

Like most memory foam products, this pillow has a slight odor when you first unbox it. The smell comes from the manufacturing process and is common with mattresses, bed toppers, and memory foam pillows. The good news is that it dissipates after a few days of airing out.

Requires Occasional Fluffing

Some users report that the shredded memory foam pillow doesn’t always hold its shape as firmly as solid block foam alternatives. You may need to give it an occasional fluff to redistribute the fill and maintain optimal support. This is a trade-off for the adjustability feature.

Also, when adjusting the fill, small foam pieces can escape from the pillow cavity. It’s not a major issue, but keep that in mind when adding or removing foam.

How It Compares

Sijo FlexCool vs Coop Original Pillow

The Coop Sleep Goods Original Pillow is a popular adjustable shredded memory foam option, but it lacks the advanced cooling technology found in the Sijo FlexCool. Reviewers note that the Coop Original sleeps slightly warm. If you’re a hot sleeper, the Sijo FlexCool is the better choice for its dual-layer cooling system.

Both pillows offer similar adjustable loft features with extra fill included. The Sijo FlexCool adds the 0.4 Q-Max cooling fabric and phase-change lining that the Coop doesn’t have.

Sijo FlexCool vs Purple Harmony

The Purple Harmony Pillow uses a completely different technology: the GelFlex Grid polymer instead of shredded memory foam. It’s notably heavier and provides a firmer feel. Purple offers excellent cooling through the gel grid, but less adjustability than the Sijo.

Choose the Sijo FlexCool if you want the plush feel of memory foam with full loft customization. Go with Purple if you prefer a firmer, more structured support and don’t mind the higher price point. You can read my full Purple Harmony Pillow review for a detailed comparison of the GelFlex Grid technology.

Sijo FlexCool vs Tempur-Pedic Breeze

Tempur-Pedic Breeze pillows sit at the premium end of the market with pricing substantially higher than the Sijo FlexCool. They offer their signature TEMPUR material with Breeze cooling technology. The foam conforms more slowly than shredded memory foam.

For most hot sleepers seeking value, the Sijo FlexCool delivers comparable cooling at a fraction of the price.

Final Verdict

The Sijo FlexCool Shredded Memory Foam Pillow earns a 4.2 out of 5 rating. It delivers on its cooling promises better than most memory foam pillows I’ve tested, and the adjustable loft feature genuinely solves the one-size-fits-all problem that plagues most pillows.

The Good Housekeeping award is well-deserved. Hot sleepers will appreciate the instant cool sensation and sustained temperature regulation. The combination of quality materials, customizable support, and reasonable pricing makes this a solid choice for most sleepers.

Minor drawbacks like potential cover shrinkage and initial off-gassing are worth noting but not dealbreakers. If you sleep hot and want an adjustable memory foam pillow that actually delivers on cooling, the Sijo FlexCool is worth considering.