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Smartwool put all of their smarts into these new and improved Women's PhD® Run Ultra Light Micro socks. You won't break your stride, thanks to the Indestructawool™ technology designed for added durability and an Achilles tab designed to help prevent sock slippage. And by adding a brand-new Shred Shield™ technology to one of their best running socks, the wear and tear from toes is reduced, helping you push toward your finish line and achieve higher mileage.
Not sure of your size? Here is Smartwool's recommended sizing chart:
| Size | Small | Medium | Large | X-Large |
| Womens US | 4 - 6.5 | 7 - 9.5 | 10 - 12.5 | |
| Mens US | 3 - 5.5 | 6 - 8.5 | 9 - 11.5 | 12 - 14.5 |
| EU | 34 - 37 | 39 - 41 | 42 - 45 | 46 - 48 |