Ever wondered why you're shivering at 60 feet while your dive buddy seems perfectly comfortable in the same water? Choosing the right wetsuit is one of the most personal decisions you'll make as a diver, and getting it wrong can mean cutting dives short—or worse, facing hypothermia without even realizing it. In this episode, Ray Hollister draws on more than forty years of fitting divers and testing gear in Florida waters to break down everything you need to know about wetsuit selection, from how thermal protection actually works to why that expensive suit with the fancy logo might be completely wrong for your diving conditions.

• It's not the neoprene keeping you warm—it's the thin layer of water your body heats inside the suit, which is why proper fit matters more than thickness or brand name.

• Neoprene compresses  ...