Marmot mens arch rock short synthetic but modern this technical hiking short is built with abrasion resistant nylon that wicks and quickly dries stretch and a gusseted crotch allow unencumbered movement rated with maximum sun protection and coated with a water repelling finish the arch rock has two hand pockets two back pockets and a zippered side pocket features abrasion resistant nylon fabric bluesign approved fabric packable breathable lightweight performance woven fabric ult