Zoom icon Click to expand Tap to zoom Chevron down icon Chevron down icon Men's RFL OTC Ultra-Lightweight by Darn Tough $28.00 Black / L - Sold out Black / Medium - Sold out Black / XL - Sold out Black / Small - Sold out Eclipse / Large - $28.00 Eclipse / XL - $28.00 Black Eclipse Color Chevron down icon L Medium XL Small Large Size Chevron down icon Availability: Translation missing: en.general.icons.icon_check_circle icon Only 3 left! 1 2 3 4 5 6 7 8 9 10+ Quantity Chevron down icon Quantity Add to cart Spinner icon This item is a recurring or deferred purchase. By continuing, I agree to the cancellation policy and authorize you to charge my payment method at the prices, frequency and dates listed on this page until my order is fulfilled or I cancel, if permitted. 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.