The Landing Zone™ Elbow/Forearm Guards feature a two-piece, articulating design for maximum protection along with a full range of motion. Ventilated plastic and perforated foam to help keep you cool. "Set-and-forget" strap design. Available in S/M and L/XL sizes. Sizing Help: Circumference of fully flexed bicep: S/M: up to 14" L/XL: 14.25" +