Sealy Advanced Waterproof Zippered Mattress Protector

You can feel confident that this will encompass your entire mattress and block out allergens and water, but it comes with significant tradeoffs. The material is quite thick compared to other waterproof mattress covers I've used (only one face is waterproof, and the rest is a thickly woven polyester). It definitely runs pretty hot underneath you--in fact I'm not sure I'll be able to keep using it into the summer, which kind of defeats the purpose of buying it. It also fits really really big on my thick foam mattress, so much so that you might wonder at first if you got sent the wrong size. A good mattress protector gives you peace of mind without constantly reminding you it's there by bunching up under your sheets and making you hot, and that's not this one.