Fit: Natural fit, lightweight two-piece design Bicep: Independent bicep with molded Hyperlite foam and PE inserts Forearm: Molded Hyperlite foam and PE inserts Cap: EVA foam covered cap Straps: Two-Stage neoprene and elastic lock strap gives unparalleled fit Lining: Bio-Dri™ moisture wicking liner with anti-microbial treatment Ventilation: ARC Air Release Channels in lining for better air circulation