The outsole of this product is either a SugarSole™ sole, a responsible compound using sugarcane foam that allows us to reduce our reliance on fossil fuels by replacing petroleum-based ethylene, or a Treadlite by UGG™ sole. SugarSole™: The sugarcane in our SugarSole™ foam allows us to reduce our reliance on fossil fuels by replacing petroleum-based ethylene, absorbing 1.6 pounds of CO2 for every pound of ethylene replaced. SugarSole™: The sugarcane in our SugarSole™ foam allows us to reduce our reliance on fossil fuels by replacing petroleum-based ethylene, absorbing 1.6 pounds of CO2 for every pound of ethylene replaced. Suede upper Back zipper pull made from 100% recycled polyester fibers Adjustable ankle strap with hook-and-loop closure Textile lining made from 100% recycled polyester fibers Insole made from 100% recycled polyester textile Contoured EVA midsole SugarSole™ EVA midsole SugarSole™ EVA outsole Recycled polyester stripe Heat-embossed UGG® logo