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I feel the cold. When tropical diving I wear a full 5mm and am comfortable. I tried a 3mm once was ok for the first dive but doing multiple dives over multiple days began to chill very fast. Ended up wearing a shorty over my 3mm. Lesson learnt. Tolerance to cold is very personal I wear a two piece 7mm with hood in waters 25degressC and I'm fine, one of my friends is good in a 5mm down to 18. Once water drops below 22 I'm in a drysuit. Good luck with your search. Regardless of thickness a full suit is always a good idea for protection against sun and stingy things.