The Boost DRT incorporates super lightweight materials and an extensive range of custom designed features to meet the performance needs of the serious dancer. These include: Variable lacing system with custom fit provides support & optimum arch fit. Fully built in arch support & elevation for maximum comfort & feel. Bloch 538G is the children's version of BL 538L. Available in black, meduim width only. Fitting: 1 size larger than street shoes for children.