Nike Unisex Dri-Fit Solar Arm Sleeve An innovative fabric helps keep you cool when the action heats up - Dri-FIT technology helps keep you dry and comfortable Elastic gripper tape helps keep the sleeve in place - Flat seams feel smooth against your skin Jersey fabric with spandex stretches for a comfortable fit Contains one pair of arm sleeves with storage bag Bicep Measurements X-S/S: 8-10 in, S/M: 10-12 in, M/L: 12-14 in, L/XL: 14-16 in