ECCO Men's O2 GTX-M 100% Leather Imported Rubber sole Perforated upper made of soft and smooth yak leather GORE-TEX SURROUND waterproof construction with increased breathability ensures an optimal climate for your feet and 100% protection from the elements High density insole enhances moisture transportation Direct-injected PU midsole foam and foot-fitted last provide long lasting cushioning and outstanding walking comfort Durable and lightweight TPU outsole provides outstanding flexibility and all day comfort