The Mountain Hardwear Sunblocker™ Long Sleeve Shirt - Men's blocks 98% of harmful UV rays with UPF 50+ protection, all in 100% recycled fabric that's comfortable enough to wear constantly. Melange textures and muted earth tones keep you looking low-key whether you're deep in the backcountry or just hanging at the river. Sun protection that doesn't feel like you're wearing sun protection, which makes all the difference on long summer days.