Royal Robbins Expedition Dry L/S Relaxed fit UPF 50+, Beat the heat: fights high heat and maximum sun exposure TempraTech thermoregulation mesh under the upper back ventilation panel TempraTech mesh has ultra-wicking fibers enhanced with heat-activated thermoregulation technology to keep you dry, cool and comfortable all day long Travel pocket system - two Classic chest pockets with hook and loop, one hidden side entry pocket with - zipper