DARN TOUGH. 6020 DENIM. DERBY CREW LIGHT. DENIM. Built with the same comfort durability and function that crushes thru-hikes and comes back for more the Derby s silky Merino Wool and eye-catching look make it your go-to lifestyle sock for urban treks. Performance Fit - No slipping no bunching and no blisters. Fine Gauge Knitting - Unprecedented durability and our unique -put it on forget it s on- feel. Fast Action Wicking - Pulls moisture away from skin. Fast drying. All Weather Performance - Cool in the summer warm in the winter. Naturally Antimicrobial - Repels bacteria and odor.