When you're out there, the last thing you want to think about is your feet, which is why Smartwool created the PhD Pro Light Crew Socks. These socks feature Smartwool’s Indestructawool technology and 4 Degree elite fit system for the best strength and fit. 4 Degree body-mapped mesh vents enhance breathability, preventing sweat buildup. Achilles straps provide extra protection and warmth. Escape without distractions and feel supported wherever your feet take you in these premium merino wool socks.