Infinity F Black School Shoes from Clarks. This lace-up school shoe features a shaped removable insole and cushioning around the heel collar for comfortable and supportive all-day wear. With the insole removed, this shoe is ideal for use with orthotics. Made from a leather upper and lining, Infinity is an attractive premium quality school shoe. This version of Infinity is a F fit for a wide fit. Widths come in: C - Extra Narrow D - Narrow Fit E - Standard Fit F - Wide Fit G - Extra Wide Fit