Black Gravel Arm SleevesThis is where shadow meets texture. A charcoal base with a black halftone pattern that adds depth to your every move. Piars perfectly with our Black Gravel Crew Socks. Arm Sleeves The new Sox Footwear arm sleeves is a blend of lightweight material and moisture wicking properties essential to every workout. The sleeves regulate your body temperature according to each season; cooling and protecting you from harmful UV rays and sunburn during the summer,