Adjustable wrist strap size. Instruction: Insert your hand into the opening of the wrist ball and secure it after adjusting the size to suit your hand size. PATIKIL 2.5 Inch Sports Wrist Ball , Baseball Rubber Rebound Mixed Colors Bike Covers for 2 Bikes on Rear Bike Rack - 600D Heavy-Duty Secure Fit and Lock Compatibility: Features a lock-hole for added security; adjustable buckle strap and toggle fit ensure this outdoor bike cover stays in place even on windy days PRO BIKE TOOL Bicycle Cover for Outdoor Storage - for 1 2 or 3 Bikes - 2 Style Options - Stationary Use for Yard or Garden - Travel Use for Car Racks... Anti-UV and Waterproof Material: This cover’s high-grade PU coating provides dependable UV and rain protection, making it an ideal bike rain cover for outdoor storage year-round Travel-Friendly Design: For use on car racks, this waterproof bike cover includes three-point straps and press clamps to lessen billowing, keeping bikes stable on road trips Size Options for Multiple Bikes: Large fits 1 bike - 76.4x45.3x30.3 in; X-Large for 2 bikes - 81.5x45.3x30.3 in; XXL for 3 bikes - 81.5x46.5x45.3 in; measure bike setup to match size Bicycle Cover Heavy-Duty Bike Covers Outdoor Storage Waterproof 2 Or 3 Bikes Heavy Duty Riptstop Material Waterproof And Antiuv Protection For Mountain s Bike Tent Road Bike