Premium nylon-spandex exterior with a DWR coating sheds water without adding bulk. 0.5 mm neoprene core for lightweight insulation. Soft, smooth and hydrophobic interior feels great against bare skin. Titanium-laminate adhesive helps retain body heat. Anatomically shaped left and right feet for a superior fit and unmatched comfort. When your tootsies need just a little more, the NRS HydroSkin 0.5 Wetsocks provide the perfect amount of insulation under neoprene booties and wetshoes. Better yet, take your Chaco and sock game to the next level.