Mainstays Cooling Waterproof Fitted Mattress Protector, King
Mainstays Cooling Waterproof Fitted Mattress Protector, King
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Mainstays

Mainstays Cooling Waterproof Fitted Mattress Protector, King

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Bed Size:King
Pack Size:Single

Key item features

  • Cooling Comfort: Super soft and cool to the touch for a comfortable sleep experience.
  • Waterproof Protection: TPU coating provides waterproof protection against spills and stains.
  • Allergy Barrier: Acts as an allergen barrier to help maintain a clean sleeping environment.
  • Antimicrobial Treatment: Treated with an antimicrobial agent to inhibit the growth of odor-causing bacteria.
  • Easy Fit: Fitted design with stretchable sidewalls fits most mattresses up to 15 inches for quick and easy on/off.
  • Machine Washable: Easy to clean and maintain with machine washable convenience.
  • King Size: Designed to fit king-sized mattresses.
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Current price is $35.64
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About this item

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Customer ratings & reviews

4.3 out of 5 stars
stars1,932 ratings458 reviews
How item rating is calculated
  1. 5 stars72% (1,387)
  2. 4 stars10% (191)
  3. 3 stars6% (116)
  4. 2 stars3% (60)
  5. 1 star9% (178)

Reviews summary

Pros

  • : Provides layer against liquids and spills.
  • : Provides gentle, breathable feel.
  • : Offers good quality at a lower cost.
  • : Fits tightly and securely around the mattress.
  • : Made with durable and comfortable components.

Neutral

  • : Can be effective for mild sweating, but may struggle with excessive perspiration.
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Showing 1-3 of 458 reviews

Apr 15, 2026
Walmart customer
Item details
Bed size: King
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

Great value

This mattress cover did its job and while not the best quality, was well worth its money. If you want something that will protect your mattress well and get a good value for your money, look no further. It did make some noise when moving around but not too much.

Helpful?36Y8XPW5FGCJ1307804516
Apr 24, 2026
Abigail
Item details
Bed size: King
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

Perfect cooling protector

We had originally bought a more expensive protector that made our bed so hot and I would wake up drenched in sweat. This protector is cooling you can barely even tell it's on. Will have to see how well it protects the bed, we have a new baby and breastfeeding so that was the biggest concern. Fits our king bed easily.

Helpful?36Y8XPW5FGCJ1307804516
May 26, 2026
Jill
Item details
Bed size: King
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

So Good It's the 2nd One I Own

I purchased this before for my Full size bed (back when the cooling ones were blue) and it's been a godsend for keeping my bed cool during hot summer nights living in the California desert. I just moved out of state to Missouri and with the hot humid summers, I re-purchased for my new King bed and it has been very nice. I love that it doesn't shift and that it fits my deep mattress. Would definitely recommend.

Helpful?36Y8XPW5FGCJ1307804516