Fox 6" Flexair Merino Socks All Day on the Trail, Feet Sorted Built for MTB riders who put in long days on the trail and can't afford to think about their feet, the Flexair Merino delivers the natural temperature regulation and odor resistance of a 55% merino wool blend with the stretch and durability of modern synthetic fibers. Mesh zones keep airflow moving when the climbs heat up, while a compression arch, flat-stitch toe, and 6" rib-knit upper handle comfort and fit from the first pedal stroke to the last. Features55% merino wool construction delivers natural moisture-wicking, temperature regulation, and odor resistance on long rides Mesh zones increase airflow at key areas so your feet stay cool during hard efforts Compression arch support reduces fatigue and keeps the sock locked in place for the duration Flat-stitch toe construction eliminates pressure points and chafing against your shoe liner Size Chart Size S/ML/XLMen's US Shoe9-1111-13EU Shoe39-4243-45 | Fox Apparel | 6" Flexair Merino Socks Men's | Size Large/extra Large In Black