9 Best Waterproof Mattress Protectors of 2026

Most waterproof protectors cover the top of the mattress and leave the sides as plain fabric, which is fine for sweat but not for a toddler's accident or a senior dog that has an off night. The AllerZip encasement closes that gap. Protect-A-Bed's own comparison chart lists its LiquiDry waterproof layer on all 6 sides, and the encasement zips shut with a Bug Lock closure the maker describes as bed bug proof. Stretch corners fit mattresses from 6 to 18 inches deep, and the surface is listed as whisper quiet and safe for a hot water wash. The brand says it is used by hotels and pest control professionals. It cost $79.99 on Protect-A-Bed's US store when we checked, with 100-night returns. The trade-off is effort: getting a full encasement on or off means lifting the mattress, so most families leave it on permanently and add a cheaper fitted protector on top for quick changes. Protect-A-Bed also sells an Essential encasement at $64.99, but it only fits mattresses 6 to 11 inches deep.

SafeRest's Premium Cotton protector is the classic terry-topped cover, and it is the best fitted option here for most families. The surface is cotton terry over a membrane back coating, which SafeRest says protects against fluids, urine, perspiration and allergens while staying noiseless and breathable. Terry soaks up moisture on the surface, so small spills and sweat do not sit on top. It comes in every size from crib to California king, goes on like a fitted sheet and is machine washable and dryer safe. A twin cost $39.99 on SafeRest's US store when we checked, with a 10-year warranty, free shipping and 30-day returns, and SafeRest reports a 4.6 star average across more than 280,000 verified reviews of its protectors. Two caveats: the product description uses the word water-resistant, and like all fitted covers it protects only the top of the mattress. For heavy nightly accidents, put it over a six-sided encasement.

Linenspa's Premium Smooth protector is the low-cost answer when you need several waterproof covers at once. Linenspa describes it as 100 percent waterproof protection for the top of the mattress, built from a polyester surface and a polyurethane backing, and promises no rustling and no change to how the mattress feels. It slides on like a fitted sheet and fits mattresses up to 14 inches thick, which covers most kids' beds, bunk mattresses and guest beds but not every tall hybrid. The care label says to machine wash hot and tumble dry on low, with no bleach. A twin cost $15.99 on Linenspa's own store when we checked, with free shipping in 1 to 3 business days and a 10-year limited warranty on US purchases. At that price, buying two per bed so one is always clean is realistic. The limits are depth and coverage: liquid that runs to the edge can reach the unprotected sides.

Bedsure's Diamond Quilted pad suits shoppers who want a waterproof barrier and a softer top in one layer. Bedsure says a built-in TPU layer blocks liquids, and the pad uses a four-layer quilted construction meant to feel plush rather than plasticky. Full elastic edging and deep pockets keep it on the mattress, which matters when a dog jumps on and off the bed all day. The pad is OEKO-TEX Standard 100 certified, made of polyester and machine washable with a low tumble dry. A twin cost $47.99 on Bedsure's US store when we checked, with free shipping on orders over $59. One thing to check before ordering: the product page lists a 22 inch deep pocket in the features but says it fits mattresses up to 16 inches in the size section, so use the size guide and assume 16 inches to be safe. Like other fitted pads, it protects only the top surface.

Purple's Waterproof Mattress Protector replaced its older water-resistant protector with a cover the brand calls 100 percent waterproof and stain resistant. It is made from a blend of polyester and thermoplastic polyurethane that Purple says is quiet and crinkle-free, and the fabric is described as anti-microbial and hypoallergenic. Enhanced stretch is meant to keep the feel of Purple's own mattresses, which also makes it a reasonable fit for other soft or responsive beds, and it comes in Standard and Deep Pocket versions. Purple backs it with a 10-year warranty and a 30-day return period, though the customer pays return shipping and the product must be clean and undamaged. Purple's page did not show a USD price in a form we could verify from our location, so the price is pending. The protector is a strong fitted option, but it still leaves the underside of the mattress uncovered.

Casper's Waterproof Mattress Protector is a straightforward fitted cover from a mattress brand. Casper says the waterproof design guards the mattress against dirt and spills and that the crinkle-free materials keep its mattresses feeling the way they should. On the product page it shows 4.2 stars from 1,687 reviews, and one recent reviewer bought it for grandchildren who wet the bed. It was in stock and listed as shipping in 1 to 2 business days with free shipping. A twin cost $98.10 on sale when we checked, down from $109, which is roughly six times the Linenspa price for a similar top-surface job. Casper also sells a Breathable Mattress Protector from $116.10 for hot sleepers. The product page itself gives few technical details about the waterproof layer, so shoppers who want specifics on materials and depth have fewer facts to go on than with Protect-A-Bed or Linenspa.

TEMPUR-Protect is the protector Tempur-Pedic builds for its own beds. It uses polyester fabric backed with a thin waterproof polyurethane laminate, with added stretch so it moves with memory foam, and mesh CertainFit sides that fit mattresses from 8 to 16 inches deep. The fabric is the brand's ThermalSense material, which it says balances temperature, and Split King and Split California King sizes make it practical on adjustable bases where each side moves on its own. The care label says machine wash cold and tumble dry low with no chlorine bleach. A queen cost $169 when we checked, with free shipping and a 10-year limited warranty. Two things count against it: Tempur-Pedic accepts no returns on this product, and its own review section shows a 3.6 star average from 1,638 reviews, the lowest rating we saw. For non-Tempur mattresses, cheaper covers do the same job.

Sleep Number's Total Protection pad is the one product here that protects the mattress warranty as well as the mattress. Sleep Number says its waterproof, stain protective surface extends down the sides for more protection against liquids and spills, which is better edge coverage than most fitted covers. The pad is antimicrobial, has a cool-to-the-touch surface that lets heat and humidity escape, and uses a conforming fit designed for Sleep Number beds, with a label that marks which way it goes on. Buy it within five days of a Sleep Number 360 smart bed and Sleep Number adds a 10-year limited warranty covering the mattress against almost any stain. A twin cost $129.99 when we checked, and the page shows 4.6 stars from 20,520 reviews. Care is fussier than most: Sleep Number asks for a large-capacity front loading washer, a delicate cycle and low heat drying. Outside a Sleep Number bed, the price is hard to justify.

Avocado's protector is built around materials first. Two layers of GOTS-certified organic cotton surround a thin, breathable polyurethane membrane made with a corn-derived ingredient, kept to about 5 percent of the protector by weight. Avocado reports that independent lab testing of every component for 679 PFAS substances detected none, and the protector carries GREENGUARD Gold and MADE SAFE certifications. It comes in a standard pocket for mattresses up to 16 inches and a Deep Pocket version for up to 22. The sale price was $135 against a $169 list price when we checked, with a 100-night trial, free shipping and a 1-year warranty. For this list, the key line is Avocado's own description: the membrane holds back spills, sweat and occasional accidents long enough for cleanup. That is honest, and it makes this a poor primary choice for nightly bedwetting or a pet with incontinence. It ranks last here for that reason, not for quality.