Royal Robbins Men's Desert Pucker Dry S/S TeeTENCEL Modal fibers utilize responsibly sourced wood and a process that uses 50% less carbon emissions and water consumption than comparable fibers. (Results based on LCA standards (ISO 14040 44)) HeiQ Smart Temp body temperatureactivated thermoregulation technology keeps you cool when temperatures rise. Drop in chest pocket with sunglass sleeve UPF 40+ sun protection (except colors 237 Beach and 783 Sky)