The longer your head stays warm the longer your body will too. The Star Hood 2mm is a game-changer when it comes to beating the cold and wind chill featuring flatlock stitching and junction taping inside. M-Flex Neoprene - 100% Flatlock stitching design Critical taping inside Mesh neoprene side panels - Closed cell neoprene with one side of fabric lamination. The outside of the mesh neoprene offers a better protection against wind chill.