Monokel is a sustainable unisex eyewear firm based in Stockholm (Sweden). The main material of their frames is acetate of first quality made by plants and all the black frames are made with recycled acetate. The lenses are made by Carl Zeiss Vision®. Each one of the frames are hand-made with great attention to detail in a process that sometimes lasts about three months. The brand philosophy of Monokel comes from a mixture of simplicity and functionalism.