How to Measure and Choose the Size? Please measure your bandage and wrap's circumference. Make sure it covered inside the size circumference we provided. It fits for Upper Knee Circumference: 13.7" to 19.6" (35cm to 50cm). The sleeve length: 19.6 inch. Long enough to cover the surgery site. Soft and comfortable. Much easiler to pull over the leg without help. Saved tons of time over saran wrap and tape. Easy to pull on and off in a non-painful way.Material Upgarded. The upper neoprene seal part now we used is imported. More durable than before. The thickness is 3mm now, thicker than other 2mm shower cover on the market. Durable and tear-resistant. We are sured it can last through your recovery. Keep dry and seal tight for your knee surgery incision,no leakage.Reasonable Size Design for Post Surgery Knee Shower Protection. Ou knee shower cover is both larger and longer. The diameter of the neoprene seal part is 8.4 inch, bigger than other 7.2 inch knee shower cover on market. The flexible opening holes make comfortable entry of your leg without causing any pain or discomfort. Keep your bandage and cast dry when shower. Great for knee surgery and wound. Enjoy your comfortable showers without worrying about the dressing getting wet.Correct usage for this adult knee shower cast cover. Roll the rubber seal to the outside (so it doesn't touch your skin at all), slide it on, then roll the seal down. Notice: when taking shower, you will sweat a bit inside the cast but that is normal. If your leg is swelling post surgery, please control your shower time within 20 minutes to avoid cutting the circulation.Adult shower cast and bandage protector for knee. An excellent knee recovery shower aids came to change your life! No more trash bag and tape. Made shower taking a breeze. Neoprene cuff seals the area and protects the dressing from all moisture.