The Seamless UV Arm Covers are your partner in crime for hot days. Featuring NILIT(R) Breeze yarns, these covers not only provide UV protection but actively lower your body temperature. - NILIT(R) Breeze yarns react to body heat and sweat to aid in cooling and have been independently verified to lower body temperature. - Engineered construction minimizes edges and stitching, creating a smooth, compressive feel against your skin. - Fabric Content: 84% Polypropylene, 8% Polyamide, 8% Polyester