KASSL teams up with Tretorn to make its mark on the brand’s signature rubber footwear. The Eefje Mule Boot is an easy slip-on style, offering a whole new take on the classic clog. Sculpted with clean lines on the upper and stabilised with a metal shank in the sole, they offer a sturdy fit and a stylish look for all occasions. They’re made with the environment in mind, too, with a FSC-certified natural rubber construction and a breathable insole made from algae.