What Our Gearhead(R) Experts Are Saying:"Inspired by one of the toughest endurance runners, this sock is built for long miles on the trail. The merino blend keeps feet cool, dry, and odor-free, while the zero-cushion design ensures a barely-there feel. Whether you're racing across deserts or hitting mountain trails, this sock is ready for anything."The Pro Series Zero Cushion 3/4 Crew Trail Sock is built to withstand the extremes. Whether you're running through scorching deserts or frigid mountain landscapes, the merino wool blend wicks moisture, regulates temperature, and resists odor-ensuring comfort mile after mile. The zero-cushion profile enhances breathability, while the Definitive Fit System(TM) and foot-molding Memory Stretch(TM) provide a secure, blister-free fit. For those who push the limits of endurance, this sock is made to go the distance.