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I use a 5mm full suit. I just came back Saturday from the Big Island and the water temperature was 76 - 78F and dipped to 74 on a deeper dive. You will see dive guides in full 7-8mm with hoods right now.Tagging on to this to avoid a new thread. I'll be in Kona next week and have a 7mm full or a 3mm shorty and 3mm vest to chose from. In December I dove in 80°-82° water in Cozumel in just the shorty and was fine. What should I take to Kona?