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The PhD Ultra Light is like your second skin. This ultra sensitive sock is for the skier who wants nothing but ultra thin Smartwool for moisture and temperature control between them and their boots. The PhD Ski Ultra Light has the same silhouette as the classic Ski Ultra Light, except with a 4-Degree Fit System for all-day fit and WOW Technology in high density impact zones to reduce shock and abrasion. Socks can make or break a day out on the slopes, make that day, make it with the PhD Ultra Light.