They are the swiftwater leather.

Crocs Men's Swiftwater Leather Fisherman Sandal | Casual Slip On Sandals for Men https://www.amazon.com/dp/B01H6NXKXC/ref=cm_sw_r_cp_api_glt_fabc_9GRQPRQMT5RHT0H5MMRB?_encoding=UTF8&psc=1