When it comes to running socks, we pull out all the stops to keep making improvements on our products. With brand-new Shred Shield™; technology to help improve wear in the toe box, our PhD® Run Ultra Light Micro socks feature the 4 Degree™; elite fit system and our Indestructawool™; technology for a dialed-in fit and improved durability. See below for sizing details.
Size Guide (based on shoe size):
- Small: men's 3-5.5; women's 4-6.5
- Medium: men's 6-8.5; women's 7-9.5
- Large: men's 9-11.5; women's 10-12.5
- XL: men's 12-14.5
