Sizing runs Small. Size up for more comfy fit. D30 high-performance shock absorbing foam T5 + Optional Cold Test (-10C). Perforated neoprene enhances venting and moisture control. Soft mesh panel at inner elbow to keep your arms cool. Integrated comfort pad on the center elbow. Terry lined wicking for comfort. Woven upper elastic comfort strap keeps your pad from riding down. Kevlar front shield keeps your pads from getting chewed up on concrete and asphalt.