webril undercast padding is constructed of 100% cotton fibers for soft cushioning and can be used with either synthetic or plaster casting material. padding is processed to minimize bulk and dimensional changes that lead to movement of padding under cast. retains consistency; wet and dry product will not collapse as padding absorbs moisture. padding has short fibers, creating a hook-and-loop effect, which prevents pressure points, creates a combination of mild stretch and cohesiveness, and holds padding in place without shifting or bunching.