A decent mattress protector is the unsung hero of your sleep set-up. It keeps the star of the show (your mattress) in pristine condition, and can come with other benefits, such as being hypoallergenic or cooling. Right now, you can snap up a queen Purple Waterproof Mattress Protector for $112 at Purple, down from $149. That's the lowest price I've tracked it all year, which is an excellent discount on the best waterproof mattress protector we've ever tested. As well as being 100% waterproof, it's noiseless, lightweight and virtually undetectable beneath your sheets. While I love it, the Purple protector is on the pricey side. That's why I've included a cheaper alternative from SiJo, which comes in at $60 for a queen in today's extended Cyber Monday mattress and bedding deals. Let's take a

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