Smartwool Phd Run Graduate Comp Ultra Light Ptn Socks, Smartwool Green, Small Wicking, temperature regulating and designed to reduce the fatigue and speed the recovery of legs, SmartWool's PhD V2 socks have a graduated compression design and an ultralight, non-cushioned sole to reduce bulk and keep things cool. Itch-free merino wool is temperature regulating, moisture wicking and odor resistant Graduated compression design reduces fatigue and speeds recovery Ultralight non-cushion design eliminates bulk and improves fit Made in United States of America (yarns imported)