Pezatec and Pezaflex stretch outer fabric. Outer fabric treated with water repellent Teflon HP. Pezaflex inserts under the arms. Waterproof Tektor reinforcement on shoulders with reflective piping. extended back. back and underarm ventilation. Elastic waist. Ergonomic collar. Sleeve narrowing by Velcro closure. large red area: arms and chest. 1 patch pocket on the left arm with smartphonepocket "splash proof". Zipper. 2 inset side pockets with "splash-proof" zipper.