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Designed with the earth in mind, Otto has been made with organic cotton, paired with super soft bamboo cotton blend lining and ample padding for the enhanced comfort. Featuring an antibacterial cushioned foam inlay, leather heel, toe reinforcements and a flexible TPR outsole, the Otto is the perfect, earth-friendly sneaker that kids will love year-round. The Otto has been approved by the American Podiatric Medical Association, recognised as a product that promotes good foot health.
| Foot Length (mm) | Insole Length (mm) | EU | US | UK | Age |
| 126-132 | 140-142.5 | 21 | 5.5 | 4.5 | 1.2 yrs |
| 132-138 | 146-149 | 22 | 6 | 5 | 2 yrs |
| 138-144 | 153-155 | 23 | 7 | 6 | 2 yrs |
| 144-151 | 159.5-162 | 24 | 8 | 7 | 2-3 yrs |
| 151-157 | 166-168 | 25 | 8.5 | 7.5 | 2-3 yrs |
| 157-163 | 172.5-174.5 | 26 | 9 | 8.5 | 3-4 yrs |
| 163-170 | 178-181 | 27 | 10 | 9 | 3-4 yrs |
| 170-176 | 185-187.5 | 28 | 11 | 10 | 4-5 yrs |
| 176-182 | 190-192.5 | 29 | 12 | 11 | 4-5 yrs |
| 182-189 | 196.5-199.5 | 30 | 12.5 | 11.5 | 4-5 yrs |
| 189-195 | 203-206 | 31 | 13 | 12 | 5-6 yrs |
| 195-202 | 210-212.5 | 32 | 13.5 | 13 | 6-7 yrs |
| 202-208 | 216.5-219 | 33 | 1.5 | 1 | 7-8 yrs |
