Experience durability at its peak with the PhD Outdoor Light Crew. Featuring Indestructawool technology, a patent-pending wool-based durability construction, these socks are ready for any adventure on your list. Plus, with redesigned mesh zones, a Virtually Seamless toe and the 4 Degree elite fit system, these socks have comfort covered. The women's-specific fit provides an overall slimmer fit and narrower heel.