We use only the very best limestone neoprene, Yamamoto Neoprene from Osaka Japan. Yamamoto has set the standard for quality and innovation with their advanced manufacturing techniques. Yamamoto limestone neoprene has an independent cell structure that is different than the more commonly used petroleum based neoprenes. It is more durable, stretchier, lighter weight, returns to form better, and offers an excellent insulation to weight ratio. We also love it because of its low water penetration letting us wear thinner suits without sacrificing warmth.