Outdoor Research Chain Reaction Qtr Zip Lds – Light Pewter Beat the desert heat (and its repercussions) with the Chain Reaction tops, named after the classic 5.12c arête at Smith Rock. Each piece packs in UPF 50+ sun protection, ActiveFresh™ odor control technology, send-enhancing stretch, as well as a wicking and quick drying performance so you’ll dry off just in time for the next go. FABRIC : 86% polyester, 14% spandex