Whether you're logging miles on forest trails or grinding out those long slow distance runs on pavement, the Darn Tough Pacer Ultra-Lightweight Running Micro Crew Sock is engineered to disappear on your feet while delivering serious performance. This isn't just another running sock – it's your secret weapon against the fatigue, hot spots, and distractions that can derail a perfect training session. The premium merino wool blend actively wicks moisture and regulates temperature so your feet stay comfortable mile after mile, while True Seamless™ toe construction eliminates the irritating seams that plague lesser socks. Targeted arch support locks everything in place with zero slippage, and strategic terry loop cushioning under the foot provides that essential rebound when you're pounding rocky trails. At just the right micro crew height, these ultra-lightweight socks block trail debris without adding bulk to your shoe, creating that "second skin" feel that serious runners demand – and with Darn Tough's legendary lifetime guarantee, they might just be the last running socks you'll ever need to buy.