Designed with the technology you need for lasting comfort and warmth, the PHD Outdoor Lt Pattern Crew features a 4 Degree Elite Fit system and patented ReliaWool technology for optimal support in high impact areas. Smartwool merino wool provides warmth and comfort. Women's specific fit offers optimal comfort. 4 Degree fit system provides enhanced mobility, stretch and recovery . Patent pending ReliaWool technology in high impact areas provides comfort and support. Strategically placed mesh ventilation zones provide ventilation provides temperature and moisture control . Flat knit toe seams prevent chafing and reduce irritation. Lightweight padded construction . Over the ankle fit for protection from the elements.