Size guide Altra
ALTRA size guide – choosing the right shoe and size
With this size guide, our goal is for you as a customer to be able to choose shoes that fit your feet as easily as possible.
The size chart below is a general size guide for Altra shoes. The cm measurement indicates the inside measurement of the size.
| MR | ||||||||||||||||
| US | 7 | 7.5 | 8 | 8.5 | 9 | 9.5 | 10 | 10.5 | 11 | 11.5 | 12 | 12.5 | 13 | 14 | 15 | |
| UK | 6 | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 | 9.5 | 10 | 10.5 | 11 | 11.5 | 12 | 13 | 14 | |
| EUR | 40 | 40.5 | 41 | 42 | 42.5 | 43 | 44 | 44.5 | 45 | 46 | 46.5 | 47 | 48 | 49 | 50 | |
| CM | 25 | 25.5 | 26 | 26.5 | 27 | 27.5 | 28 | 28.5 | 29 | 29.5 | 30 | 30.5 | 31 | 32 | 33 |
| WOMAN | ||||||||||||||
| US | 5.5 | 6 | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 | 9.5 | 10 | 10.5 | 11 | 11.5 | 12 |
| UK | 3.5 | 4 | 4.5 | 5 | 5.5 | 6 | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 | 9.5 | 10 |
| EUR | 36 | 37 | 37.5 | 38 | 38.5 | 39 | 40 | 40.5 | 41 | 42 | 42.5 | 43 | 44 | 44.5 |
| CM | 22 | 22.5 | 23 | 23.5 | 24 | 24.5 | 25 | 25.5 | 26 | 26.5 | 27 | 27.5 | 28 | 28.5 |
In the product description for most models you will find a specific size guide with measurements for each size.
NOTE: The inner dimensions may differ between different models even if the size is the same.
How to measure your foot
It is normal for your right and left feet to be slightly different in size, so it is important to base your shoe size on the larger foot.


3. Step aside and measure the distance from the wall to the book. This is the measurement of your foot.

*) The foot is at its largest when under load, i.e. when the foot is placed on a step. This is the measurement used to determine the correct size.
A good recommendation is to have a space about the size of a thumbnail (about 1 cm) between your toe and the edge of the shoe at the front of the shoe. Remember that some people prefer a little less space and others a little more space.
For example, if you are going on longer trips, your feet will probably swell a bit and you should have more than 1 cm of space.
ALTRA's last
What is a shoe last and why is an Altra last unique? A shoe last is a shape that resembles a foot and is used to make a shoe. Altra designed its shoe last based on healthy and natural feet and then developed shoe last that are shaped like feet, not the other way around.
Altra makes shoes that are shaped like feet, many different types of feet!
Altra's shoes have 3 important features :
FootShape™ Toe Box - All shoes feature a foot-shaped toe box, allowing the toes to relax and spread naturally and the big toe to be in a straight position for maximum stability and power.
Balanced Cushioning™ - All Altra shoes are built on a balanced cushioning platform, which means the heel and forefoot have equal amounts of cushioning so that the shoe is completely flat. This naturally flat position of the foot facilitates a natural running stride with less stress on the feet, legs, knees and back.
Fit4Her™ Technology - All women's shoes are built around the unique shape of a woman's foot. Women typically have a narrower heel and midfoot, higher instep, and longer arches. Altra is the first running shoe brand to design an entire line of shoes specifically for women.