La Sportiva to Arc'teryx shoe size
The short answer
La Sportiva 39.5 is Arc'teryx 8 by the two brands' own charts.
At least one of the two brands publishes no foot length, so the rows line up the US size both charts print. Treat it as the label conversion, not a fit.
| La Sportiva | La Sportiva builds it for | Arc'teryx, by chart | Same label | Arc'teryx builds it for | Arc'teryx also prints |
|---|---|---|---|---|---|
| 36 | not published | 5.5 | not published | not published | US men's 4.5 · UK 4 · EU 36 2/3 · CM / JP 22.5 |
| 36.5 | not published | 5.5 or 6 | not published | not published | US men's 4.5 · UK 4 · EU 36 2/3 · CM / JP 22.5 |
| 37 | not published | 6 | not published | not published | US men's 5 · UK 4.5 · EU 37 1/3 · CM / JP 23 |
| 37.5 | not published | 6.5 | not published | not published | US men's 5.5 · UK 5 · EU 38 · CM / JP 23.5 |
| 38 | not published | 7 | not published | not published | US men's 6 · UK 5.5 · EU 38 2/3 · CM / JP 24 |
| 38.5 | not published | 7.5 | not published | not published | US men's 6.5 · UK 6 · EU 39 1/3 · CM / JP 24.5 |
| 39 | not published | 7.5 or 8 | not published | not published | US men's 6.5 · UK 6 · EU 39 1/3 · CM / JP 24.5 |
| 39.5 | not published | 8 | not published | not published | US men's 7 · UK 6.5 · EU 40 · CM / JP 25 |
| 40 | not published | 8.5 | not published | not published | US men's 7.5 · UK 7 · EU 40 2/3 · CM / JP 25.5 |
| 40.5 | not published | 9 | not published | not published | US men's 8 · UK 7.5 · EU 41 1/3 · CM / JP 26 |
| 41 | not published | 9.5 | not published | not published | US men's 8.5 · UK 8 · EU 42 · CM / JP 26.5 |
| 41.5 | not published | 9.5 or 10 | not published | not published | US men's 8.5 · UK 8 · EU 42 · CM / JP 26.5 |
| 42 | not published | 10 | not published | not published | US men's 9 · UK 8.5 · EU 42 2/3 · CM / JP 27 |
| 42.5 | not published | 10.5 | not published | not published | US men's 9.5 · UK 9 · EU 43 1/3 · CM / JP 27.5 |
| 43 | not published | 11 | not published | not published | US men's 10 · UK 9.5 · EU 44 · CM / JP 28 |
What wearers say
Charts describe a garment. People who own both brands describe a fit, and their answer ranks above this table once five of them stand behind it. Pick your size in the converter to see whether there are enough yet.
Sources
- La Sportiva size guide, read on 2026-09-17. La Sportiva on TrueToSize
- Arc'teryx size guide, read on 2026-09-18.