A cast and bandage protector that uses a seal ring but avoids water pooling and seepage. It uses a flexible, stretchable and deformable diaphragm stretched tightly over a seal ring in order to seal the ordinarily open end of a flexible sleeve of waterproof material. The rigid seal ring flexible holder holds the flexible sleeve open and the diaphragm tightly stretches over and above it to minimize water pooling seepage and leaking about the interface of the diaphragm and the limb of the patient wearing the cast and the cast protector.
