If you love wearing your Birkenstocks in the summer youll love these Birkenstock Boston sheepskin lined mules for Men. The upper is made of premium quality tan suede leather and the footbed is lined with super soft shearling sheepskin. Sheepskin helps with temperature regulation ensuring your feet arent too hot but also helps avoid them becoming too cold and of course is biodragable unlike many man-made fleece linings Birkenstock - Boston Fur Sheepskin 1001140-13 (tan Suede)