Made of a durable cotton material.Deep pocket for a secure position of the arm and elbow. Adjustable slide buckle on strap for best fit and easy application.The thumb loop helps prevent the wrist from dropping. The elbow should be in a 90 degree angle when applied correctly.Indications:As relief at casting of the hand, forearm or upper arm, clavicle fractures and shoulder injuries.Available in six sizes: two pediatric and four adult. The pediatric sizes feature cartoon print.Take the measurement from the tip of the elbow to the MCP joint of the little finger.