KJ POWERSHOE Silver - Blue Size 4 - 6 (inner sole 26cm) – this is the KJ-Power Edition, silver/blue, size: 1-3, 4-6, for juniors, boys & girls, from 6 years up, weight from about 20kg to about 55kg. Main features: a high quality hard shell boot with a comfortable, breathable & machine washable liner which adapts to 3 sizes, to allow foot growth. Versatile Tension Springs, with 4 TwinTurbo System, which allow customized adjustments. Optional steel KJ Coil Springs (sold separately) can be adapted, for additional customized effects.