Altra is an American brand that runs relatively small. If you're unsure, you can also check the US size of your current shoes for comparison.
For the most accurate measurement, make sure to measure your feet at the end of the day, as they can swell towards the end of the day.
Size chart Altra Men and Women
| CM | EU | UK | US | UK | US |
| M/F | M | M | V | V | |
| 22 | 36 | 3.5 | 5.5 | ||
| 22.5 | 37 | 4 | 6 | ||
| 23 | 37.5 | 4.5 | 6.5 | ||
| 23.5 | 38 | 5 | 7 | ||
| 24 | 38.5 | 5.5 | 7.5 | ||
| 24.5 | 39 | 6 | 8 | ||
| 25 | 40 | 6 | 7 | 6.5 | 8.5 |
| 25.5 | 40.5 | 6.5 | 7.5 | 7 | 9 |
| 26 | 41 | 7 | 8 | 7.5 | 9.5 |
| 26.5 | 42 | 7.5 | 8.5 | 8 | 10 |
| 27 | 42.5 | 8 | 9 | 8.5 | 10.5 |
| 27.5 | 43 | 8.5 | 9.5 | 9 | 11 |
| 28 | 44 | 9 | 10 | 9.5 | 11.5 |
| 28.5 | 44.5 | 9.5 | 10.5 | 10 | 12 |
| 29 | 45 | 10 | 11 | ||
| 29.5 | 46 | 10.5 | 11.5 | ||
| 30 | 46.5 | 11 | 12 | ||
| 30.5 | 47 | 11.5 | 12.5 | ||
| 31 | 48 | 12 | 13 | ||
| 32 | 49 | 13 | 14 | ||
| 33 | 50 | 14 | 15 | ||
| 34 | 51.5 | 15 | 16 |
Altra | Trail Gaiter
An annoying twig or stone in your shoe can be a wonderful Pause your run. Protect your feet with the Altra Trail Gaiter. Go full throttle through snow, sand, rocks, and leaves with the confidence that the durable and highly breathable material will keep your shoe free of trail debris. The strapless design works with any trail shoe, but is perfect when paired with an Altra GaiterTrap Shoe. And thanks to the strapless design, you can change shoes and socks without removing the gaiter. Take your trail running to new heights with the Altra TrailGaiter.
FEATURES
* S/M: shoe size 37-43
* L/XL: shoe size 44-49
* Protects your feet from dirt, sand, rocks and snow.
* The strapless design allows you to change your shoes and socks without the agitator to remove.
* Can be attached to all Altra trail shoes (extra Velcro piece included for other trail shoe brands)
* Highly breathable stretch material with high abrasion resistance.
* Weight: 37 grams
