Beginners, experts, fast, slow, time, pace, effort. Like a fartlek workout, this ultra-lightweight ¼ sock is adaptable and playful in any terrain for any runner. Cushion underfoot, protection around the ankle, and blister-free, moisture-wicking Merino Wool construction mean extra comfort and durability. A new low-profile knit cuff will match your pace, while targeted mesh over the foot will keep you cool.