SN instructed that keeping your regular cast dry is very important! There are no devices that are 100% effective in keeping any cast dry. Sponge baths are the safest way to keep the cast dry. If you have to take a bath or shower, please follow these instructions: place a towel or washcloth around the upper portion of the cast. Cover the entire cast with 2 plastic bags ( use two in case one has a leak, secure the bag at the top with tape or a rubber band, if the cast gets moist, dry the top or bottom of the cast using a blow dryer. Use only the cool or low setting, if the cast is soaked all the way through, it needs to be changed ( call doctor office )