The IB903F features the Island Pro Black Lug sole and original foot bed design with arch, heel cup and outside contour. The upper is crafted in our Tiger fabric with suede lining in an extra wide strap for comfort and support. After a short break-in period, the soft EVA insole will self-mold to your foot's unique shape. If you are looking for lots of mileage and a slipper that lasts, this is the one for you.