Wicking, quick-drying stretch nylon fabric packs down small in a pack or suitcase Sleeves can be rolled up and secured with button tabs UPF 50 sun protection Back vent has a mesh yoke underlay to help keep you cool Side and underarm inset panels provide more comfort and ease of movement Chest pockets have hidden hook-and-loop closures Secure zip pocket at left side seam to stash cash or other small necessities Pocket sunglass loop provides an easy place to park your shades Locker loop lets you hang the shirt to dry Machine wash cold; do not bleach; tumble dry low Contains materials that meet the bluesign® criteria Made in a Fair Trade Certified™ factory REI is Climate Neutral Certified; as we work to actively reduce our footprint, we measure annual carbon emissions and purchase an equivalent amount of verified carbon credits Excellent condition