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Guide-built for high-energy activities in cold weather—from alpine climbing and skiing to hiking, camping, and fishing. Next-to-skin crew features exclusive FreeHeat™ Pro polyester/spandex. The cutting-edge fabric actively generates additional heat when worn against the skin by harnessing kinetic ultraviolet energy.
Active: Our most athletic fit. Close to the body without restricting mobility.
Active Heating Technology
Our proprietary FreeHeat™ Pro fabrics make your body feel warmer in cooler weather with thermally efficient yarns. The thermal science utilizes ceramic particles in extruded yarns that spark molecular vibration when exposed to sunlight. The result is increased warmth when worn against skin as the fabric actively generates additional heat by harnessing kinetic ultraviolet energy at the molecular level.