Sizing Help
Find Your Perfect Fit
All Guyisa safety boots use international (CN) sizing — the number on the shoe. Match your foot length in the chart below, or convert from your US size. When unsure, measure your foot.
Golden Rule: Always size up by 1 when ordering safety boots. Steel toe caps need room at the front — your toes must never press against the cap. Thick work socks add to this further. When in doubt, go one size larger.
Measuring Guide
How to Measure Your Foot
You only need a piece of paper, a pen, and a ruler. Takes 2 minutes.
Prepare
Place a blank sheet of A4 paper on a hard floor. Wear the socks you plan to wear with the boots — thick work socks add 1–2 sizes.
Trace
Stand on the paper with your full weight. Trace around your foot with a pen held vertically. Do both feet — most people's feet differ slightly.
Measure
Measure the distance from your longest toe to your heel in millimetres. Add 10mm (1cm) for comfort clearance. This is your target foot length.
Match
Find the closest matching mm value in the table below. Use the size shown. If you fall between two rows, always go up to the larger size.
Conversion Chart
Size · Foot Length · US
| Size (CN) | Foot Length (mm) | Foot Length (cm) | US Size |
|---|---|---|---|
| 35 | 225 | 22.5 | 4.5 |
| 36 | 230 | 23.0 | 5 |
| 37 | 235 | 23.5 | 5.5 |
| 38 | 240 | 24.0 | 6 |
| 39 | 245 | 24.5 | 6.5 |
| 40 | 250 | 25.0 | 7.5 |
| 41 | 255 | 25.5 | 8 |
| 42 | 260 | 26.0 | 8.5 |
| 43 | 265 | 26.5 | 9 |
| 44 | 270 | 27.0 | 9.5 |
| 45 | 275 | 27.5 | 10.5 |
| 46 | 280 | 28.0 | 11 |
| 47 | 285 | 28.5 | 11.5 |
| 48 | 290 | 29.0 | 12 |
Ready to order?
Now find your size in stock →
Browse all 55 Guyisa models. Click any shoe to see live stock in your size.