Mara sand gtx Boots & wellies Black available in size 6 Women's Clarks Mara Sand Gtx leather boot with round toe, inside zip fastening and elasticated inside panel, gum sole and 1.2 inches heel. With fixed insole. The width of the shoe in size 5 is 3.8 inches. Impeccable styling, beautiful glazed leather decorated with topstitching and a buckle on the calf: the Mara Sand Gtx boots are the chicest of casual boots - wear to the max!