You dont need a doctorate to know the Smartwool PhD Ski Light 3-Pack will be a treat for your feet. Sold as a three-pair pack. Over-the-calf sock style. PhD technology for high performance wear. 200 needle construction provides high density, low profile cushioning. Light cushioning construction features cushioning at the shin and sole for warmth and impact protection. 4 DEGREE ELITE FIT SYSTEM features bi-elastic fit bands that provide faster flex and recovery at the ankle, instep, and arch. Indestructawool technology for supportive durability. Strategically-placed mesh vents for temperature and moisture management. Flat knit toe seam for lasting durability. Style Number: SW015030 56 percent wool, 42 percent nylon, 2 percent elastic. Machine wash, tumble dry. Made in the USA and imported.