Constructed with DexShell's patented three-layer, four-way stretch technology, the waterproof Terrain Walking Socks 2.0 have been upgraded with merino wool for both the inner and outer layers. This creates an authentic, luxurious feel with the utmost warmth and performance. These waterproof mid-calf merino wool 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.