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The BT Racer Sock is a mid length sock for your coldest runs, made with our heat generating Breath Thermo® technology, this lightweight sock boasts all the warmth you need without the bulk.
Men's | Women's | |
Small | --- | 6 - 8.5 |
Medium | 6 - 8.5 | 8.5 - 10.5 |
Large | 9 - 11 | 11 - 13 |
XLarge | 11.5 - 14 | --- |