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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 | --- |
