UK sizing. The Meindl Matrei is an all-purpose boot with a wide Comfort fit last. The only thing this boot can't do is heavy-duty trekking with a monster pack. The ankle provides a bit of support, but the boot is comfortably supple. Full leather upper, metal lace hooks and Meindl's quality control help predict this shoe to have a long service life. *Note!* The polyurethane midsole benefits from frequent use: don't leave your boots unused for long periods of time. Whenever possible, choose a cool storing space instead of, for instance, heated floor. - Waterproof-breathable Gore-Tex membrane - High quality leather surface (nubuck/suede) - Meindl Comfort fit last (wider last than the standard last used in Meindl trekking boots) - Specially designed footbed made of such materials as fleece and cork - A/B stiffness: gentle ankle support, more flexible than trekking boots We recommend you follow the measuring advice in the size chart.