KNEE PILLOWS·COMFILIFE
ComfiLife Knee Bolster for Back Sleeping
4.4 · 6,258 reviews
Editor score8.2/10
Best for: Back sleepers wanting a trusted-brand bolster
Sleeper
Back sleepers
Shape
Memory-foam bolster
Fill
Memory foam
The back-sleeper bolster from the category's bestselling brand — a memory-foam half-cylinder that props the knees to relieve the lower back.
This is ComfiLife's answer for back sleepers: a memory-foam bolster that sits under the knees to keep them gently bent, flattening the lumbar arch and taking load off the lower spine. Same trusted ComfiLife foam and washable cover as their side-sleeper contour, just shaped for lying on your back — and useful under the ankles for leg elevation too. It's a straightforward, well-made bolster at a fair price. Like all under-knee pillows it's back-sleeping only, and its single loft won't suit everyone, but for lumbar relief from a brand people already trust it's an easy pick.
Price across 3 retailers
Prices checked 2026-07-04Prices shown were last checked on 2026-07-04and can change at any time — the price on the retailer's site at checkout is the one that applies. As an Amazon Associate and affiliate we may earn a commission on purchases made through these links, at no extra cost to you.
How our prices work
We show the lowest price we found at our last check (2026-07-04) and the manufacturer's list price for comparison. Retail prices — Amazon's especially — move constantly, so treat these as a guide: the price shown on the retailer's own page at checkout is the one that applies. Tap through to see each retailer's current price.
Should you buy it?
What we like
- Props knees to unload the lower back
- ComfiLife's proven foam + washable cover
- Doubles as a leg-elevation wedge
- Fair price from a bestselling brand
What to know before buying
- Back sleeping only
- One loft height won't fit everyone
- Memory foam can trap heat
At a glance
SleeperBack sleepers
ShapeMemory-foam bolster
FillMemory foam
StrapNo
CoverWashable, removable
Best forLumbar relief
AlsoLeg elevation
Reviews6,000+
Price~$33
How it scores
How our 8.2/10 breaks down — rated on the dimensions that matter most for knee pillows, from hands-on testing and verified specs, not the marketing.
Alignment support
8/10
Comfort
8/10
Breathability
7/10
Durability
8/10
Value
8.5/10
Compare with alternatives
Quick verdicts for the knee pillows most often considered alongside the ComfiLife Knee Bolster for Back Sleeping.
VS·HEAD-TO-HEAD
ComfiLife Knee Bolster for Back Sleeping vs Everlasting Comfort Under-Knee Pillow
The back-sleeper's pick — an under-knee bolster that lets the knees bend to flatten the lumbar arch, and the highest-rated pillow here.
→ Back sleepers with lower-back pain
VS·HEAD-TO-HEAD
ComfiLife Knee Bolster for Back Sleeping vs 5 STARS UNITED Half-Moon Knee Pillow
The low half-moon bolster — a subtler under-knee lift for back sleepers who find full bolsters too tall, at a friendly price.
→ Back sleepers who want gentle, low lift
Decision support · what no other comparison site has
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Frequently asked questions
ComfiLife bolster vs Everlasting Comfort?
Both are back-sleeper under-knee bolsters. Everlasting Comfort rates a touch higher (4.5) with a cool-touch cover; the ComfiLife bolster comes from the category's bestselling brand and doubles for leg elevation. Near-tie — pick on cover feel and price.
ComfiLife bolster vs ComfiLife knee pillow?
Same brand, opposite sleepers. The bolster goes UNDER the knees for back sleeping; the hourglass knee pillow goes BETWEEN the knees for side sleeping. Choose by how you sleep.
Can I use it to elevate my legs?
Yes — propped under the calves or ankles it works as a leg-elevation wedge for circulation or swelling, not just under the knees for back support.
Is it firm enough to last?
It uses ComfiLife's dense memory foam, which holds its shape and lift better overnight than the soft foam in cheap bolsters that flatten by morning.
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