Mens Astroman Long Sleeve Shirt M - Earth. Designed in conjunction with legendary climber Hans Florine, and built specifically for exposed climbs on sunny days, the Astroman L/S Shirt provides UPF 50+ protection and stretches, wicks and breathes. Additional sun protection comes from the shirt's Sun Snap Collarâ¢, which folds up and snaps in place to shield your neck from solar rays.