YUNCHI Waterproof Full Leg Cast Cover for Shower Extra Wide Adults for Knee Brace, Large Plaster Dressings, After Operation Boots, Non Slip Reusable Protectors Showering (XL Full Leg). UPGRADED SUPER LIGHTWEIGHT & PATENT DESIGN: YUNCHI extra-wide long leg cast cover for shower adults upgraded to a super lightweight, thin vacuum ring( 1.45cm) and with a not accumulation water design to effectively prevents water from seeping in and creates an impenetrable watertight seal just upper the knee to keep leg dry.
eBay