The knee pillow that stays
Every other knee pillow fails the same four ways. We read 4,962 reviews to prove it. Then we built the one that does not.
Be first when we launch on Kickstarter. From $55 at launch · $69 + $4.99 shipping at retail · 1-year guarantee · free returns shipping.
4,962 reviews. Five product categories. Same four failures, every time.
Falls off. Wrong size. Wrong firmness. Can’t be washed. We built against all four, in the order buyers ranked them.
You are going to love it. We guarantee it. If you do not love your Plumb kit, send it back within 1 year of receipt for a full refund. Returns shipping is free. Defects are replaced free, anytime. Read the full guarantee →
We want you to love your sleep, not just buy it.
A soft knit thigh sleeve with an open-ended elastic pocket on its inner side. The foam pillow slides into the pocket; a washable pillowcase goes over the foam. When you turn, everything turns with you. There is nothing to reattach in the dark.
A soft tubular knit (viscose made from bamboo), about five inches tall, on the upper thigh of your top-resting leg. The foam pillow is already seated in the pocket, under the washable pillowcase.
Roll, twist, kick. The sleeve grips the thigh and the pocket carries the pillow with it. The pillow does not slip out from between your knees because the leg the pocket is on is going wherever you are going.
Pillow still in place. No reaching for it on the floor. No towel between your knees as backup. No 3 a.m. adjustment.
Designer working sketches (pencil + ink). Final illustrations land once the first production run does.
We coded 4,962 knee-pillow reviews against a unified taxonomy to find out exactly what fails for whom. The list below is the answer, in the order buyers complained about it. Plumb is designed against that list, in that order.
The pillow on the floor by 2 a.m. is the #1 complaint in every brand we coded. Plumb's foam pillow slides into an elastic pocket on a thigh sleeve. The sleeve moves with the leg that moves. The pillow goes where the leg goes. That is the whole design.
"Too short for tall people." "Too small for big thighs." "Too contoured for slim ones." Two sleeve sizes — Regular up to 28 inches, XL 28–32 inches — thigh-circumference fit, cut against U.S. anthropometric data. Not a one-size guess.
Most knee pillows are spec'd to feel nice in a showroom. Buyers call them "a block of wood" or say they "go flat in a week." Plumb's foam is specified for the load your thighs actually put on it. The foam is a replaceable insert, so when it wears, you swap the insert, not the product. See the load math →
Every other knee pillow is one foam block you cannot wash. Plumb is three pieces — the thigh sleeve, the foam pillow, and a washable pillowcase over the foam. The sleeve and the pillowcase go in the machine. The foam airs out and is replaced as a consumable when it wears.
The honest comparison. Plumb does five things. Most products in the category do one or two.
| Plumb | Strap pillow | Wedge | Padded sleeve | |
|---|---|---|---|---|
| Stays put all night | ✓ | Mixed | ✕ | Mixed |
| Sized for your body | ✓ | ✕ | ✕ | ✕ |
| Foam spec'd for thigh load | ✓ | ✕ | ✕ | ✕ |
| The parts that touch you, wash | ✓ | ✕ | ✕ | Cover only |
| 1-year guarantee, free returns | ✓ | ✕ | ✕ | ✕ |
Category claims based on the 4,962-review corpus. "Strap pillow" includes all wearable knee-pillow brands with a buckle or velcro strap. "Wedge" is half-moon and contour-block designs. "Padded sleeve" is sleeve-style products without independent sleeve sizing or replaceable foam.
A thigh sleeve. A foam pillow. A washable pillowcase. The pieces do different jobs, and each one is replaceable on its own when it needs to be.
A soft tubular knit (viscose made from bamboo) worn on the upper thigh, with an open-ended elastic pocket on its body-side surface. Silicone dot grippers on the inner top rim hold the sleeve in place without binding. The pocket holds the foam pillow against your inner thigh through any sleep position you take, and releases one-handed when you want to take it off.
A contoured hourglass foam core, CertiPUR-US polyurethane. Sized to match the sleeve. Two thicknesses. The foam is the consumable — when it eventually compresses, you swap the foam, not the whole product.
A knit cover that slides over the foam pillow, between the foam and the elastic pocket. Removable. Machine washable on cold, tumble dry low. The sleeve also washes. The two parts that touch you both come off and go in the wash; the foam stays clean inside.
Designer working sketches (pencil + ink). Final product photography lands once the first manufacturing run does.
Working sketches and product study renders. The full set lives on the investor brief.
Backed by Plumb's 1-year customer guarantee: full refund, free returns shipping, defects covered indefinitely. You are going to love it. We guarantee it.
Reserve my spotPlumb runs lean by design. We'd rather get fit right in two sizes than fake choice with five.
| Component | Choice | Fit guide |
|---|---|---|
| Sleeve | Regular | Up to 28 in. upper-thigh circumference |
| Sleeve | XL | 28–32 in. upper-thigh circumference |
| Pillow | 5-inch | Default for most adults |
| Pillow | 6-inch | Larger frames or firmer mattresses |
Measure around the fullest part of your upper thigh, about three inches below the crease. If you're between sizes, size down — the sleeve needs to be snug enough for the silicone grippers to engage. Below the Regular range or above the XL cap, email us before ordering and we'll talk through fit.
Slate-blue Midnight as the default. Warm-oatmeal Dune as the alternate. Sage-green PLUMB embroidered on the front of each sleeve. No purple, no neon, no logos beyond the wordmark.
That is the entire design. The sleeve grips the upper thigh; the foam pillow slides into an open-ended elastic pocket on the body-side of the sleeve; a washable pillowcase goes over the foam between the foam and the pocket. The sleeve moves with the leg that moves, so the pillow goes where the leg goes.
No. Plumb is a comfort and sleep-alignment product. It's not intended to diagnose, treat, cure, or prevent any condition. If you have a medical issue affecting your back, hips, knees, or sleep, talk to your physician.
Padded sleeves on the market put the cushion inside the sleeve, against the inner thigh of the worn leg — squeezed against your own skin — and can't be washed because the foam is sewn in. Plumb's case sits on the body-side of the sleeve so the foam pillow stays in the inter-thigh gap rather than compressed against your thigh. The sleeve-and-case is one knit fabric system that machine-washes; the foam pillow is a separate consumable replaced when it wears.
The sleeve is soft knit and stretches significantly — closer to the feel of a wide compression sock than a strap. The grip comes from silicone dots, not from tightness. If a tester reports any numbness, tingling, or skin marks, we redesign. That's a hard kill criterion.
A contoured hourglass polyurethane foam core, CertiPUR-US certified. About twelve inches long, seven inches wide, five inches thick (baseline) or six inches (optional).
Most knee pillows are one foam block you can never wash. Plumb is built so the parts that touch you wash, and the part that doesn't, doesn't. The sleeve-and-case is one knit fabric system that machine-washes cold and air-dries. The foam pillow inside is never washed — it airs out between uses and is replaced as a separate consumable when it eventually wears.
The sleeve-and-case is a viscose-made-from-bamboo knit, targeted at the breathability profile typical of viscose-blend sleepwear. Per FTC textile labeling guidance, the fiber is described as "viscose made from bamboo," not "bamboo" alone. Third-party thermal testing is planned before launch.
Two sleeve sizes — Regular (up to 28 in. upper-thigh circumference) and XL (28–32 in.). Measure around the fullest part of your upper thigh, about three inches below the crease. If you're between sizes, size down. Pillow thickness: five inches for most adults, six inches for larger frames or firmer mattresses.
Many side sleepers find a knee pillow more useful during pregnancy, and Plumb is designed to stay in place better than a loose pillow. We don't make any pregnancy-specific health claims; talk to your provider about what's appropriate for you.
Plumb launches on Kickstarter. The first 200 backers lock in $55 Early Bird. The Standard tier is $59. Retail after the campaign is $69 plus $4.99 shipping. Join the waitlist below to be first in line when the campaign opens.
You are going to love it — we guarantee it. You will have a full year from when your kit arrives to decide. If you do not love it, send it back for a full refund. Returns shipping is free. Defects are replaced free, anytime. Read the full guarantee →
We are not shipping yet. Here is the actual status:
We would rather show you where we are than dress this up. If you want a more polished website, come back after the wear test. If you want a knee pillow that does not migrate, we are ready when you are.
We are building Plumb around side-sleeper input, not guesses. If you sleep on your side, take the two-minute survey. The first 100 finishers can take a $5 gift card or send the $5 to the National Coalition for the Homeless.
Take the fit check →I am a side sleeper. For years I have woken up at 3 a.m. with my knee pillow on the floor. I tried straps. I tried wedges. I tried a padded sleeve. None of them stayed.
Last winter I started reading reviews of every product in the category I could find. 4,962 of them, eventually, coded against a shared taxonomy. The same four failures came up in every brand. So I designed against those four failures, in the order people complained about them.
In a previous life I counted beans — literally — as a mathematical statistician for the USDA’s National Agricultural Statistics Service. Once you have spent a few years counting beans for a living, counting bad knee pillows is mostly a hobby.
Plumb is the product that should already exist. I am a little annoyed it does not. If you have been waking up on the floor too, you are in good company.
— Mike
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Backed by Plumb's 1-year customer guarantee: full refund, free returns shipping.
We will send a small number of useful updates — test results, fit guidance, launch timing, and early-backer access. No spam, no upsells, no shared list.
