https://www.decathlon.com.hk/en/help/services/_/R-a-size-guide
Children's roller
| Foot Length(CM) | EU | UK | US | BR | CM | MM/W | |
| 17.6-18.2 | 29 | 10.5 | 11 | | | | |
| 18.3-18.8 | 30 | 11.5 | 12 | 28 | 19.0 | 190/2 | Yellow area exactly the same when |
| 18.9-19.5 | 31 | 12 | 12.5 | 29 | 19.5 | 195/2 | 2023 Hazel 6yrs old Decathon roller shoes |
| 19.6-20.2 | 32 | 13 | 13.5 | 30 | 20.0 | 200/2 | |
| 20.3-20.8 | 33 | 1 | 1.5 | | | | |
| 20.9-21.5 | 34 | 1.5 | 2 | | | | |
| 21.6-22.2 | 35 | 2.5 | 3 | | | | |
| 22.3-22.8 | 36 | 3 | 3.5 | | | | |
| 22.9-23.5 | 37 | 3 | 4.5 | | | | |
| 23.6-24.2 | 38 | 5 | 5.5 | | | |
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