Python skin Skeleton runners. A patch with the brand lettering is featured on the heel counter. Lace up fastening. 3D print polyurethane sole. Inner lining and removable insole.UPPER #1: 100% PYTHON LEATHER | LINING #1: 100% SHEEP LEATHER | LINING #2: 100% SHEEP LEATHER | INSERT #1-2: 100% ZINC (ZAMAK®) | INSOLE #1: 100% THERMOPLASTIC POLYURETHANE (TPU) | OUTSOLE #1: 100% THERMOPLASTIC POLYURETHANE (TPU)