"Our ten year old broke his arm just before we set off for our summer beach holiday in Italy. Without the Bloccs cast protector he would not have been able to go in the sea and our holiday would have been ruined. The Blocc protector was totally functional - great design, easy to use, perfectly waterproof and allowed my son to swim as normal. If you are searching for a solution to a similar problem - I would highly recommend this one. Others look too bulky and impractical."