All four that I bought (2 sets of 2) seems to be working just fine. This is the first set that we didn't buy that didn't zip around the entire mattress.
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
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
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
Protect And Comfort Your Mattress With FeelAtHome 100% Waterproof Fitted Cover For Twin Size - Soft & Noiseless Cotton Terry Fabric
18 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
Black 2-Pack Of Vivere EFHTS Accessories For Hammocks
27 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
Secure Your Swing With Safe And Easy Tree Swing Hanging Kit - 2000 Lb Breaking Strength And Quick 10Ft Long Strap Installation
34 Review