Constructed with DexShell's patented three-layer, four-way stretch technology, the Terrain Walking 2.0 Socks have been upgraded with merino wool yarn for both the inner and outer layers. This creates an authentic, luxurious feel with the utmost warmth and performance, as well as the anti-blister and anti-microbial benefits inherent in merino wool. These waterproof and breathable mid-calf length socks are designed with a cushioned bottom and elastic arch support, making them the best-in-class outdoor socks for tough hiking in arduous terrain and weather conditions.