Reach for this lightweight layer when that single-track trek is calling for more than your daily dose of vitamin D. A moisture-wicking, broad spectrum UPF 50+ fabric shields skin from both harmful UVA and UVB rays while keeping you running cool through sweltering sections. Made with HeiQ Mint, a plant-based deodorizer, it regenerates at every wash for a long lasting fresh feeling. And when low temps and less-than-desirable conditions are in the forecast, Crater Lake™ is still the go-to—pulling double duty as a perfect, breathable base under a weatherproof shell.