What is the primary purpose of using Webril before applying a cast?

The primary purpose of using Webril before applying a cast is to protect the skin. This material is a soft cotton padding that serves as a barrier between the hard surface of the cast and the patient's skin. By providing this layer of cushioning, Webril helps to prevent skin irritation, pressure points, and abrasions that might occur from the cast pressing against the skin. Additionally, it aids in moisture management by absorbing sweat and other minor moisture, which can further protect the skin.

Support, absorption of moisture, and reduction of swelling are secondary considerations or outcomes of using padding, but the chief concern is to safeguard the skin from potential damage during the time the cast is worn.