For planning and expecting moms

Comfort you deserve.

Plumb is a three-piece knee pillow kit built for side sleepers. We can't promise a restful night — your body is doing extraordinary work right now, and sleep is not always negotiable. What we can do is make the hours you do sleep more comfortable, more aligned, and less interrupted by a pillow that keeps moving on you.

How Plumb works for side sleepers

Why a page for planning and expecting moms.

If you're planning a pregnancy or already expecting, side sleeping is going to be part of your life soon if it isn't already. By the second trimester, most pregnant people are sleeping on their side — that's what their bodies and their care teams are pointing them toward. A pillow between the knees becomes part of the nightly setup for most of them. The trouble is, a loose pillow doesn't stay there.

You wake up in the middle of the night reaching for a pillow that's somewhere on the bed. You repeat that two, three times a night. By the third trimester you're already sleeping in shorter stretches; you don't need an extra reason to be awake at 3 a.m. looking for a foam wedge.

Plumb is the knee pillow that stays where you put it. That's the whole pitch. Three pieces — a soft thigh sleeve, a removable washable cover, and a contoured foam pillow that attaches to the sleeve. When you turn, the pillow turns with you. You're not waking up to chase it.

How Plumb is built.

Plumb is three pieces designed to work together:

• The sleeve — a soft tubular knit (viscose made from bamboo) worn on the upper thigh of your top-resting leg. Silicone dot grippers on the inside top rim keep it from sliding. About five inches tall.
• The cover — a removable washable shell that goes over the foam pillow. Three covers in every kit, so one is always clean. The covers wash on a normal cycle.
• The pillow — a contoured hourglass foam core, CertiPUR-US certified polyurethane. Two thickness options: 5-inch baseline, 6-inch for larger frames or firmer mattresses.

The covered pillow attaches to the sleeve at the inner-thigh contact zone. The sleeve stays put because it's anchored around your thigh. The pillow stays put because it's anchored to the sleeve. The system moves as one unit when you turn over.

Things worth knowing.

A few practical notes for planning and expecting moms specifically — these are observations from our wear-test cohort and from category research, not medical advice. Your provider is the right person to ask about anything specific to your pregnancy.

• Sizing changes during pregnancy. Thigh circumference often increases through the second and third trimester. If you're closer to the 28-inch boundary between Regular (≤28 in.) and XL (28–32 in.), size up rather than down — the sleeve should be snug but not compressive.
• Pillow thickness. Most adults use the 5-inch baseline. If your mattress is on the firmer side, or if you're a larger frame, the 6-inch may track better with your hips. Either thickness can be exchanged within 30 days of receiving your kit.
• Wear it on the leg that ends up on top. Most side sleepers have a preferred side; the sleeve goes on the leg that most often rests on top. If you switch sides through the night, the sleeve stays on the same leg — the geometry still works.
• Heat regulation. The sleeve is a soft knit; it breathes the way a wide compression sock breathes. We've heard back from testers that it's noticeably cooler than wrap-around-the-cushion straps. We can't make a temperature claim beyond the materials — just noting the design intent.
• Washability. The sleeve and the covers wash. The foam pillow doesn't — that's why the covers exist. For an expecting mom, the wash-cycle separation matters more than for most users; the contact layers stay clean, the foam stays dry.

What Plumb is not.

Plumb is a comfort and sleep-alignment product. It is not a medical device. It is not intended to diagnose, treat, cure, or prevent any disease or medical condition, and it is not a pregnancy-specific health product. If you're experiencing back, hip, or pelvic discomfort, or if you're concerned about any aspect of your sleep during pregnancy, your physician, midwife, or doula is the right person to talk to.

We say this because the knee-pillow category is full of products making claims they can't back up. Plumb is positioned as a better-designed comfort product, and that's the only promise we make.

Frequently asked questions.

What's Plumb's return policy?

You have a full year from when your Plumb kit arrives to decide if you love it. If you don't, send it back for a full refund — we email you a prepaid return label, and we cover shipping both ways. If the product is defective, we replace it free, with no time limit. We just ask for your order number or the email you ordered with so we can find your purchase. Applies to direct orders from plumbsleep.com; Kickstarter backers, see your Backer Update #1. Full guarantee →

Is Plumb safe to use during pregnancy?

Plumb is a knee pillow kit. It does not contact your abdomen or back, and there is nothing in the product that is contraindicated during pregnancy. That said, talk to your provider about anything you're using during pregnancy — they're the right person to make that call, not us.

When should I switch from the Regular to the XL sleeve?

If your upper-thigh circumference is approaching 28 inches, the XL sleeve is the right fit. You can exchange sizes within 30 days of receiving your kit. The sleeve should feel snug enough for the silicone grippers to engage, but never compressive or numbing — if it cuts in, it's too small.

Can I use Plumb after the baby arrives?

Yes. Plumb is designed for side sleepers regardless of pregnancy status. The kit you order during pregnancy is the same kit you continue using afterward; the only thing that may change is sleeve size, which is what the 30-day exchange covers.

What about side-sleeping recommendations from my provider?

Most providers recommend side-sleeping in the second and third trimester. We don't know your provider's specific guidance and we don't substitute for it. Plumb is a comfort tool that may make whichever sleep position your provider recommends more comfortable — that's the limit of what we claim.

Will I wake up with the pillow in the right place?

That's the whole reason Plumb exists. The sleeve anchors to your thigh, and the pillow anchors to the sleeve. When you turn, the system turns with you. We tested this over 30 nights with four side-sleeping testers before the campaign launched.

Is the foam safe?

The foam is CertiPUR-US certified polyurethane — that's the industry program that certifies foam is made without certain restricted substances and meets a low-VOC threshold. The foam is also separated from your skin by a washable cover at all times.

Does Plumb make Plumb specifically for pregnancy?

No. Plumb is a side-sleeper product. Many expecting moms are side sleepers — that's why this page exists. But we don't make pregnancy-specific health claims, and we don't position Plumb as a pregnancy medical device, because it isn't one.