The Smartwool PhD Cycle Ultra Light Micro Sock is the lightest Merino sock on the market. It features a 4-Degree Elite Fit System, a virtually seamless toe, patent-pending technology to help make it outlast a year's worth of centuries... and very, very few ounces.

• New 4 Degree Elite Fit System uses two elastics for greater stretch and recovery to keep the sock in place
• Patent pending ReliaWool Technology in high impact areas provides the longer lasting protection to keep feet comfortable
• Low profile and durable virtually seamless toe
• Alternating 1x1 welt
• 1.5" overall height
• 57% Merino Wool, 41% Nylon, 2% Elastane
• SW071