The Smartwool PhD Cycle Ultra Light Mini Sock is a low sock for biking. Ultralight and not at all bulky, it provides just enough layer between foot and shoe. Whether you've got special cycling shoes or just pedal around in your favorite sneakers, the merino wool blend prevents blisters and regulates temperature. No bunching, just sleek foot coverage. Features of the Smartwool PhD Cycle Ultra Light Mini Sock Indestructawool Technology for enhanced durability 4 Degree elite Fit system for a dialed, Performance-oriented Fit Shred Shield Technology reduces wear from toes Body mapped mesh zones for added breathability Virtually Seamless toe for enhanced comfort Fabric Details 46% Merino Wool, 50% Nylon, 4% Elastane