orn sandals for a small feeHowever in many developed countries flip-flops are typically treated as annual or seasonal, short lasting footwear.  Depending on the material makeup of the shoe, the average pair of flip-flops lasts a year or less.  The strap between the toes can snap very easily after moderate use, and although this problem can be solved by using replacement straps that are easily "snapped" into the flip-flop, most people do not bother to repair flip-flops because they are very inexpensive and easily replaced.  These disposal habits may pose an environmental problem because most flip-flops are made with polyurethane, which comes from crude oil.  This material is a number seven resin and cannot usually be recycled in small amounts.  [3]  Because of growing environmental concerns, some companies have begun to sell flip-flops made from recycled inner tubes or car tires, as well as sustainable materials like hemp, cotton and coconut.Flip flops are also popular with those who