Women’s Heat-buster - Simms Big Sky LS: “It makes the hottest conditions feel tolerable,” our tester says after wearing this collared, long-sleeve, UPF 50, button-down on a 90°F hike in Utah’s San Rafael Swell. Credit poly/nylon yarns coated with pulverized jade (which lowers skin temperature thanks to jade’s ability to draw away body heat, much as evaporating sweat cools the skin). The fabric wicks sweat and dries fast, and despite the lack of stretch, the articulated seaming allows for full range of motion. Stink factor is average: “It started to ripen after a few days.” Guys: This fabric is available in a style for you (Stone Cold, $80). $80; 6 oz. (S); simmsfishing.comJade has the ability to draw away body heat.