How to Measure and Choose the Size? Please measure your knee circumference. Ensure it falls within the size range we provided. Fits upper knee circumference: 13.7" to 19.6" (35cm to 50cm). Sleeve length: 19.6 inches. Long enough to cover the surgery site. Soft and comfortable. Easier to pull over the leg without assistance. Saves time compared to using plastic wrap and tape. Easy to put on and remove in a non-painful manner. Material upgraded. The neoprene seal is now imported, more durable than before. Thickness is 3mm, thicker than other 2mm shower covers on the market. Durable and tear-resistant. Designed to last through recovery. Keeps the knee surgery incision dry with a secure seal, no leakage. Reasonable size design for post-surgery knee shower protection. This knee shower cover is larger and longer. The diameter of the neoprene seal is 8.4 inches, bigger than other 7.2 inch covers on the market. Flexible opening allows for comfortable leg entry without pain or discomfort. Keeps bandages and casts dry during showers. Suitable for knee surgery and wound care. Enjoy comfortable showers without worrying about wet dressings. Correct usage: Roll the rubber seal outward (so it does not touch the skin), slide the cover on, then roll the seal down. Note: Some sweating inside the cover during showering is normal. If leg swelling occurs after surgery, limit shower time to 20 minutes to avoid circulation issues. Adult knee shower cast and bandage protector. An effective shower aid for knee recovery. No more plastic bags or tape. Makes showering convenient. Neoprene cuff seals the area and protects the dressing from moisture.