ECCO Men's Biom Hybrid 2 GTX-M 100% Leather Imported Synthetic sole Gore-Tex distressed yak leather uppers Anatomical last shape - developed by scanning the feet of 2,500 athletes to provide ideal levels of support Constructed from tpu - a highly durable, wear-resistant material - the molded traction bars offer hundreds of traction angles for superb grip Technical insole system - a new, ultra-premium insole with silicon printing helps prevent unwanted foot movement during the swing