FitKicks Kid's Active Lifestyle Footwear Polyester Small (10 - 11 1/2), Medium (12 - 13 1/2), Large (1 - 2 1/2), X-Large (3 - 4 1/2) For Best Fit Measure Bottom of Foot: Small (6"), Medium (6.5"), Large (7"), X-Large (7.5") Protective toe guard prevents dragging and excessive wear FIT FLEX sole provides ergonomic comfort; Provides a natural contour and free range of motion FIT FLEX sole provides ergonomic comfort; Provides a natural contour and free range of motion