I don't know how manufacturers and sellers define waterproof, but their definition is far from mine. Water and other liquids go straight through to the mattress underneath.
Waterproof Twin XL Mattress Encasement With Zippered 6-Sided Cover, PlushDeluxe Premium Quality, And Cotton Terry Surface (Fits 12-15 Inches H)
14 Review
RV 6 Sided Zippered Mattress Protector With Secure Locking Zipper For 70X80 RV King. Creates A Natural Seal Around Your Mattress From Dust, Pet Dander, Pollen, Liquids & More. Oeko-Tex Certifiedβ¦
14 Review
Twin Size Zippered Mattress Protector Encasement - Premium Terry Absorbent Cover With Six-Sided Waterproof Protection - Quiet, Breathable, And Fully Washable
43 Review
Protect Your Twin Mattress With Zippered Waterproof Encasements - Twin 2 Pack Included
14 Review
Stylish Solid Stainless Steel Metal Strap Replacement Band For Fitbit Versa 2, Versa Lite, Versa SE - Compatible With Men And Women - Black
31 Review
Heavy Duty Waterproof Aozzy Air Conditioner Cover For Outdoor Window Units With Adjustable Straps - 17" W X 12" D X 13" H Inches
31 Review
Gulrear Portable AC Window Seal Kit - White 400CM/158Inch Hot Air Stop Exchange Guards With Zipper And Adhesive Fastener
38 Review
Black 2-Pack Of Vivere EFHTS Accessories For Hammocks
27 Review