The newest addition to Royal Robbins collection of performance pants, the Flex brings a pulled-together look to get you through a morning of meetings, an afternoon hike, and dinner at a restaurant without changing. Its breathable thermal fabric keeps you warm but not clammy on a brisk fall walk. 62% nylon, 27% polyester, 11% spandex. Men's quick-dry breathable pants with brushed surface, waistband with elastic at sides, 1/4 top pockets, zip-secured back pockets, center front snap closure, articulated knees for increased range of motion, hem cinch, half gusset for increased range of motion. Material: Nylon, polyester, spandex.