Outdoor Research Hyak Pants are stretchy and easy to move in, but they are lightweight and warm all at the same time. “How?” you ask. With movement-mirroring stretch, abrasion-resistance, thermo-regulating ActiveTemp treatment and more, the Hyak is designed to take on all the hikes, climbs and other adventures it will encounter.
88% nylon, 12% spandex
90D stretch double weave
Thermo-regulating ActiveTemp treatment at waistband