Not sure how the manufacturer and seller define waterproof but their definition is far from mine. Water and other fluids go right through it, on to the mattress beneath.
Waterproof Twin XL Mattress Encasement With Zippered 6-Sided Cover, PlushDeluxe Premium Quality, And Cotton Terry Surface (Fits 12-15 Inches H)
14 Review
Protect Your Mattress With A Premium Cal-King Waterproof And Breathable Cover - Deep Pocket And Noiseless Design For A Comfortable Sleep
11 Review
Biloban Box Spring Cover (4/5/7/9/13/17Inches) Twin, High Profile Waterproof Mattress Protector, 6 Sides Wrapping Zippered Mattress Encasement Cover
34 Review
2-Pack Twin Size Mattress Protectors With Waterproof And Cooling Features - Soft Bamboo Cover, 3D Air Design, Noiseless And Breathable Mattress Pad, Fitted For 8-18 Inch Deep Pockets
18 Review
Gulrear Portable AC Window Seal Kit - White 400CM/158Inch Hot Air Stop Exchange Guards With Zipper And Adhesive Fastener
38 Review
LOFTEK LED Dimmable Floating Pool Lights Ball, 16-Inch Cordless Night Light With Remote, 16 RGB Colors & 4 Modes, Rechargeable & Waterproof, Perfect For Indoor/Outdoor, Exhibition Decor, 1-Pack
38 Review
Stylish Bracelet Replacement Band With Diamonds For Fitbit Versa 2 Smart Watch - Compatible With Fitbit Versa, Versa Lite, And Versa 2 Bands For Women - Silver
28 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