While neoprene may form the core of a wetsuit, smoother, less “grippy” nylon, lycra or spandex is typically added to the interior to make the suit easier to pull on and off. Nylon may also be added to the exterior to protect the neoprene from damage and add a pop of color. Neoprene panels are stitched together. Flatlock stitching results in a more comfortable interior seam as it lays flat against the skin. Blindstitching, where the needle never fully pierces the materials from front to back, or gluing and taping, is often used on cold water wetsuits to limit water intrusion.