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


Shoe Size
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Reima Water Shoes – Lean

Lightweight, flexible water shoes designed for beach days, swimming, and warm-weather adventures. The Reima Lean water shoes protect little feet from hot sand, shells, and rough surfaces while still allowing natural movement.

With a breathable textile upper and flexible sole, these shoes are comfortable both in and out of the water. The zero heel drop supports a natural stance, and the removable insoles with Reima’s Happy Fit print help parents easily find the correct size.

Features

  • Lightweight and breathable design for warm-weather play
  • Flexible sole for natural movement
  • Zero heel drop for a natural stance
  • Textile upper that dries quickly
  • Suitable for swimming and water play
  • Removable insoles with Happy Fit print to help find the right size
  • Machine washable on a delicate cycle

Best For

  • Beach days and shoreline exploring
  • Swimming and water activities
  • Protecting feet from sand, shells, and rocks

Performance

  • UPF 50+ UV protection
  • Flexible thermoplastic rubber outsole for grip
  • Lightweight construction for comfortable movement

Sustainability

  • PVC-free
  • PFAS-free
  • Vegan materials (no leather used)

Materials

  • Upper: Textile
  • Lining: Textile
  • Outsole: Synthetic thermoplastic rubber

Care Instructions

  • Machine wash delicate cycle (30°C / 86°F)

Note: Like many water shoes, these may be slippery on wet tiled surfaces and are not recommended for poolside use.

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