UK sizes. When you need truly supportive hiking boots with a wide last, choose the Meindl Guffert GTX. In the European AD stiffness/support classification, the Guffert falls at level B/C, meaning the soles torsional rigidity and protection for the foot, as well as ankle support, are at a high level. Boots stiffer than this are rarely needed. The ComfortFit last used in these boots offers extra space in the toe box, allowing your big toe to align properly. This boot model also has the Meindl MFS system: memory foam panels around the ankle enable an extremely comfortable fit. The panels can be seen in yellow in the additional image. - Surface material: top quality oiled nubuck leather - Waterproof and breathable, thanks to a Gore-Tex membrane - Stiffness rating: B/C (very supportive, suitable for difficult terrain and heavy loads) - Digafix system keeps your heel in place in the heel cup - Cork insole with removable 2 mm thick middle layer (Meindl Volume Adjustment, see extra image