Upper: 100% calfskin leather Inner lining: 75% textile and 25% pig skin Sole: 100% synthetic Cushioned insole Removable insole Laced and adjustable zipper closure Thickness of the sole 3 cm (1.2") Shaft contour 23 cm (9.1") (size 37 eur/4 uk/6,5 Total shaft height 6,7 cm (2.6"). The memory foam insole contains 85% recycled material. maximum arch and heel comfort due to arch support technology giving extra cushioned support. Extra grip on bottom.