RUNNING IN THE SMARTWOOL PHD RUN LIGHT ELITE MICRO SOCKS IS LIFE CHANGING.Running will never be the same after you put on these virtually seamless socks. The Smartwool PhD Run Light Elite Micro Socks are the most advanced socks in the market with their 4 Degree Elite Fit System for maximum stretch and recovery. They feature cushioning in the ball and heel of the foot to create ultimate absorption no matter what you're doing. FEATURESIndestructawool technology for comfort and durabilityVirtually Seamless toeMesh ventilation zones for temperature control and breathabilityLight Elite cushioning in the heel and ball of the foot for shock absorptionPhD construction4 Degree Elite Fit System for greater stretch and recoveryMerino wool fibers' smaller diameter prevents the itching associated with normal woolTECH SPECSWeight: 1.23oz