Yazbeck Wetsuits are made using Yamamoto Japan Neoprene exclusively. That Neoprene, being of 100% CR closed cells Chloroprene, it owes its extraordinary and superior thermal insulation and comfort features, to the hundreds of thousands of tiny nitrogen bubbles trapped in the tiny closed cells within the Chloroprene foam of the Neoprene itself. This is similar to how a "thermos" works, using air for insulation. Air, being 80% nitrogen, is the best gaseous insulation agent.