Leather Boots GUIDI Calf LeatherDESCRIPTION DEVOA 2023 24 Autumn Winter Collection. About the leather The leather is made of 1. 8mm thick calf leather from GUIDI of Italy. The more you wear it, the more it wrinkles with a three dimensional effect. About the design and pattern The heel height is set at 4cm and the sole is designed with volume. The sole uses Vibram's Morflex sole, which is very lightweight for a massive atmosphere.