With all of the features that the PhD? Run Ultra Light Micro offers. your newest technology may be in your sock drawer. Indestructawool? technology provides you with enhanced durability. while a 4 Degree? elite fit system makes for a performance oriented fit. And Shred Shield? technology reduces wear and tear from your toes. It’s breathable. comfortable. and built to help take you farther.
| Size | US Mens |
US Women | Euro | UK |
| Small | 3–5.5 | 4–6.5 | 34–37 | 2–4.5 |
| Medium | 6–8.5 | 7–9.5 | 38–41 | 5–7.5 |
| Large | 9–11.5 | 10–12.5 | 42–45 | 8–10.5 |
| XL | 12–14.5 | N/A | 46–49 | 11–13.5 |
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