In addition to tried-and-true ROLLBAR� technology, the New Balance 813 offers the supportive cushioning of a lightweight foam midsole along with the plush comfort of a soft collar and supple leather upper. 13 mm drop: due to variances created during the development and manufacturing processes, all references to 13 mm drop are approximate. Leather upper. Soft comfort collar. Styles MW813BK, MW813WT, and MW813BR are Medicare/HCPCS code = A5500, may be eligible for Medicare reimbursement.