Unisex boot.4mm CR Flex-Foam.CR Flex-Foam adjusts to the unique contours of your foot to create a comfortable and stable foundation while resisting blisters and chafing.PK mesh lining.Comfort topline.Reinforced toe and ankle.Rubber outsole with aggressive treat pattern.Upper: Rubber/Neoprene.Lining: PK Mesh.Sole: Rubber.Colour: Moss.