Thermal protection is more than choosing between a wetsuit and a drysuit. In Chapter 4, we explore Sharkskin, hoods, hooded vests, heated systems, and advanced materials that help divers stay warmer, longer, and smarter underwater.

You already know you’re getting cold on every dive. Now it’s time to understand why and how to control it. From hidden heat loss through breathing to the real science behind wetsuits and neoprene compression, this guide breaks down what actually keeps you warm underwater and how to choose the right thermal protection for tropical diving.