MATERIALS Apex Flex Open celled neoprene that is laminated with an abrasion resistant outer jersey and a four-way stretch inner. The Apex Lite core is infused with more microscopic air bubbles making it stretchier, warmer and lighter than traditional neoprene. Apex Mesh Closed-cell neoprene with a waterproof, rubbery texture that cuts down wind-chill. The Apex Lite core is infused with 20% more microscopic air bubbles than traditional neoprene making it lighter. The unsealed inner side is laminated with a super stretch jersey for maximum flexibility.