In briefThis prospective study of 140 consecutive patients who needed cast immobilization tested the comfort, practicality, and possible cutaneous side effects of a waterproof cast liner that allows swimming, bathing, and hydrotherapy without special drying procedures. Minor cutaneous complications were observed in 4.3% of patients; none required medical care. Odor, itching, and difficulties with drying after wetting were minimal. Physician and patient satisfaction levels with the cast were high.