Zensah Reflect Compression Arm Sleeves, Black, Large/X-Large 94% Nylon 6% Spandex Imported Moisture wicking and antimicrobial proprietary fabric Reflect Technology for high visibility and ultimate safety Silver ions for thermal regulation keeps arms at perfect temperature Pin-point compression for targeted elbow support Graduated compression improves circulation to keep arms warm and loose Moisture wicking and antimicrobial proprietary fabric