4.0 NEW MATERIAL, JELLY KIDS SANDAL SIZE 19-24. Boho and Mooi's famous Jelly Welly Sandals. Created in bright pops of colour, with playful design details, Jelly Welly's are for kids who aren't afraid to express themselves! - Synthetic uppers for breathability and flexibility. - Flexible, lightweight soles for all-day comfort. - Don't let a bit of mud and dirt get in the way of outdoor adventures with these washable uppers. - Real beautiful buckles. - Keep your kids running through dewy grass and jumping into puddles with these waterproof uppers. MEASUREMENTS ARE OUTER SOLE LENGTH. MEASURE FOOT FROM BIG TOE TO HEEL TO GET THE SIZING PERFECT AND THEN ADD A LITTLE FOR GROWTH. I MEASURE FROM THE BACK BONE OF YOUR HEEL TO AROUND THE FRONT OF THE BIG TOE FOR PERFECT SIZING... SIZE 2 / 19 - 12.12CM SIZE 3 / 20 - 12.78CM SIZE 4 / 21 - 13.44CM SIZE 5 / 22 - 14.1CM SIZE 6 / 23 - 14.76CM SIZE 7 / 24 - 15.42CM SIZE 8 / 25 - 16.08CM