Zoom icon Click to expand Tap to zoom Chevron down icon Chevron down icon Men's RFL OTC Ultra-Lightweight by Darn Tough Sold out $28.00 Black / L - Sold out Black / Medium - Sold out Black / XL - Sold out Black Color Chevron down icon L Medium XL Size Chevron down icon Availability: Translation missing: en.general.icons.icon_check_circle icon Out of stock 1 2 3 4 5 6 7 8 9 10+ Quantity Chevron down icon Quantity Sold out Spinner icon Looking for Local Pick-up? Choose a store below. Product Locator by Locally Notify me when back in stock Email address Email me when available Breathe easy. Bringing together smooth Merino Wool feel, next-to-skin fit, flex and fatigue-zapping arch support, and targeted venting - the ultra-lightweight RFL is the sock experience your hard-charging feet have been dying for, lap after lap.