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.
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
Twin Size Zippered Mattress Protector Encasement - Premium Terry Absorbent Cover With Six-Sided Waterproof Protection - Quiet, Breathable, And Fully Washable
43 Review
Waterproof Twin XL Mattress Encasement With Zippered 6-Sided Cover, PlushDeluxe Premium Quality, And Cotton Terry Surface (Fits 12-15 Inches H)
14 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
Heavy Duty Waterproof Aozzy Air Conditioner Cover For Outdoor Window Units With Adjustable Straps - 17" W X 12" D X 13" H Inches
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Stylish Solid Stainless Steel Metal Strap Replacement Band For Fitbit Versa 2, Versa Lite, Versa SE - Compatible With Men And Women - Black
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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
Gulrear Portable AC Window Seal Kit - White 400CM/158Inch Hot Air Stop Exchange Guards With Zipper And Adhesive Fastener
38 Review