The SmartWool Kids' Wintersport Fox Sock was made to keep your powder pup's paws comfy from the first ride to the last. Made mostly of merino wool, the Wintersport thermally regulates, naturally resists odor, and has a non-itchy feel. ReliaWool mixes nylon and elastane in high-wear areas for durability, and the flat knit toe seam keeps bunching at bay.