Amazing fit and light cushioning for all-day wearAn ankle-high powerhouse, the SmartWool PhD Outdoor Light Mini is made for mileage. Great for long summer treks, it combines support, stretch, and recovery. Featuring Indestructawool technology for ultimate durability and the 4 Degree elite fit system for a dialed fit. Light cushioning offers impact protection on the road or trail, while the Virtually Seamless toe offers more comfort in a trail shoe.