These ultra-thin sun protection arm covers offer excellent stretch and UV protection. They quickly absorb and disperse sweat, providing a cooling effect through evaporation, making them ideal for activities with heavy perspiration during the hot season. Specifications: 【Material】79% Nylon + 21% Polyurethane 【Average Weight】25g 【Color】Black (BK) 【Size】Upper Arm Circumference: S (22 - 26cm) Lightweight and breathable black arm warmers, perfect for training and running. - Brand: mont-bell - Size: S - Color: Black I purchased these this summer, but they didn't fit because my arms are too big, so I'm selling them. I tried them on once and removed the tags. Thank you for looking.