The Outdoor Research Men's Long-Sleeve Astroman Shirt keeps you protected from harsh UV rays when you're climbing exposed routes. Its lightweight, quick-drying blend of nylon and spandex optimizes cool-wearing comfort on hot summer days. Rated at UPF 50+, the Astroman blocks the scorching sun from cooking your upper body as you conquer new projects during the dog days of summer. Plus, its fold-up collar even protects the back of your neck from searing sunburn.