UGG Australia Mens Merrick Boot Leather Insole: 7mm curly UGGpure sockliner that naturally wicks away moisture with a Poron heel wedge for extra cushioning. Outsole: Crepe wrapped around an EVA midsole for lighter weight and added comfort while utilizing a White Spider Rubber outsole for ultimate traction. Waterproof leather upper 4 eyelets and 2 speed hooks metal hardware 5 " shaft height