"Midday sun on an open ridge is where the AirExchange SolarShield Overshirt earns its place. The UPF 40 fabric shields the skin, and the collar snaps up to cover the neck when the sun climbs. Breathable, quick-drying recycled polyester keeps this sun protection shirt comfortable from the lakeshore to the trail. What Our Gearhead® Experts Are Saying:""Under a loaded pack, the flat-felled seams, which fold the fabric edges over and stitch them flat, lie smooth beneath the straps and resist abrasion. The dropped shoulders keep my arms free to swing and reach, which is why this has become my backpacking shirt."""