Sidi ARX Air CE Trainers
- CE EN 13634 certified motorcycle footwear with D3O impact protection
- Free Shipping & Returns
Find your correct Sidi size using the guide below.
Sidi footwear uses EU sizing — use the chart to convert to UK and US sizes.
Size Chart
| EU | UK | US | Foot Length (cm) |
|---|---|---|---|
| 36 | 3.5 | 4 | 22.5 |
| 37 | 4 | 4.5 | 23.2 |
| 38 | 5 | 5.5 | 23.8 |
| 39 | 5.5 | 6 | 24.5 |
| 40 | 6.5 | 7 | 25.2 |
| 41 | 7.5 | 8 | 25.8 |
| 42 | 8 | 8.5 | 26.5 |
| 43 | 8.5 | 9.5 | 27.2 |
| 44 | 9.5 | 10 | 27.8 |
| 45 | 10.5 | 11 | 28.5 |
| 46 | 11 | 11.5 | 29.2 |
| 47 | 12 | 12.5 | 29.8 |
| 48 | 12.5 | 13.5 | 30.5 |
| 49 | 13.5 | 14 | 31.2 |
| 50 | 14.5 | 15 | 31.8 |
How to Measure
Measure your foot from the heel to the tip of your longest toe in centimetres. Compare this measurement to the chart above to find your closest match.
If you are between sizes, choosing the larger size is usually the safest option for comfort.
See more in the range.
Shop FootwearThe Sidi ARX Air CE Trainers are built for riders who want lightweight, breathable protection without stepping into a full boot. Designed for warmer conditions and everyday use, they balance airflow, flexibility and impact protection in a clean, trainer-style design.
Constructed from a durable canvas membrane with ripstop reinforcement, the upper keeps weight down while maintaining strength where it matters. Integrated mesh panels promote airflow, helping to keep feet cool on longer rides or in warmer conditions.
Protection comes from D3O impact inserts combined with Fortex construction, designed to absorb and disperse energy without restricting movement. The result is a trainer that feels flexible and natural while still delivering proper motorcycle-ready protection.
The high-cut design adds support around the ankle, while the lace-up closure provides a secure, adjustable fit. Underfoot, a grip-focused sole offers stability on the pegs and comfort when walking.
