DRYPro Waterproof Vacuum Sealed Full Arm Cast Cover, Small

I brought this for my 7/8 year old son to use in the shower and on vacation. He broke his arm twice and we were able to use it about 6 months apart. He is on the thin side and the smaller end did a great job of keeping his cast dry. It comes with a hand pump to remove the air from the cast area to help keep it dry. You do not want to make it super tight while it is being worn. Very occasionally would his cast get wet and that was usually from removing it after the water activity. I definitely recommend this product.

My granddaughter broke her arm the week of the summer and this was amazing . She could swin and shower while keeping the cast dry.