Shoe Size Guide

We want to make it easier for you to pick the right shoe size. Just measure your child’s feet and choose the size in the table that matches their foot length. Room for growth and movement is already included.

How to read the table

Each size covers a range of foot lengths in millimetres, so you can choose how much growth room you want. Movement room is always built in. For example, a range of 104–109 mm is the growth room for that size. If your child’s foot measures near the top of the range (like 109 mm), there’s no growth room left in that size. It will still fit, but you may want to choose the next size up.

Barefoot shoes need less fitting room than regular shoes, and this chart already accounts for that. If you choose a size based on your child’s foot length, you can be confident barefoot shoes will fit correctly.

Size recommendations are always a guide. Every child’s feet are different, and growth spurts can happen quickly.

Foot Length (mm) EU Size UK Size
104–109 18 2.5 / 3
110–113 19 3.5
114–119 20 4 / 4.5
120–126 21 5
127–132 22 5.5 / 6
133–139 23 7
140–147 24 7.5
148–154 25 8 / 8.5
155–161 26 9
162–168 27 9.5 / 10
169–174 28 10.5
175–181 29 11
182–188 30 11.5 / 12
189–194 31 12.5 / 13
195–201 32 13.5
202–208 33 1 / 1.5
209–214 34 2 / 2.5
215–221 35 3
222–229 36 3.5 / 4
230–235 37 4.5 / 5
236–242 38 6
243–249 39 6.5
250–255 40 7


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Pairs well with

A very breathable, zero-drop barefoot shoe for kids' natural stance and movement. APMA approved (American Podiatric Medial Association) for healthy foot development. Kids' barefoot shoes Astelu are light and comfortable. The upper is breathable, elastic knit material that's just right for warm weather. The zero heel drop last enables a more natural stance and gait. These Reima shoes are machine-washable at delicate cycle, which will make your everyday easier. The flexible, thin (4 mm) rubber sole enables confident steps on various surfaces. Barefoot or minimalist shoes are excellent footwear for a child's early years and for walking on natural terrains. Are you looking for shoes for playing and running on asphalt and concrete? For bigger kids, for hard surfaces, we recommend sneakers with more shock absorption.

  • Breathable and elastic knitted upper
  • Zero heel drop for a natural stance
  • Elastic lacing for fast and easy pull-on
  • Wide last with extra room for the toes
  • Flexible sole for free movement
  • Vegan
  • Machine washable, delicate cycle in 86° F
  • Flexible rubber outsole for an ideal grip
  • Removable insoles with Happy Fit print help to find the correct size
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