Inspired by our best-selling lightweight, stretchy, technical sun shirt with UPF sun protection, the Astroman Tank is a "less is more" take on one of our ambassadors' favorite fabrics. Named after the legendary route in Yosemite Valley, the Astroman was originally built for exposed and rugged climbs, and the tank version works even better for hiking, paddling, backpacking - even dressing up for an evening out to dinner after the adventure.