The Fits Micro Light Performance Trail quater sock looks different for a reason. The high cuff is a built-in scree-guard that helps keep out the trail while you're trail running. Below the cuff is a vented lower that increases breathability during highly aerobic activities.
| Sizing Reference | |
| Men's | |
| S | 3.5-5.5 |
| M | 6-8 |
| L | 8.5-10 |
| XL | 10.5-12.5 |
| XXL | 13.15.5 |
| Women's | |
| S | 5-7 |
| M | 7.5-9.5 |
| L | 10-11.5 |
| XL | 12-14 |
| XXL | 14.5-16.5 |
| Merino Wool | 50% |
| Nylon | 40% |
| Polyester | 7% |
| Lycra | 3% |