I can wear my Henderson Hyperstretch 5mm down to 60 comfortably with hood and gloves. I've worn it down into the high 40's and it gets cold. Whopperhead (from this forum) wore his 3mm open cell suit for 6 hours in low 50's water. Up here we are a little more use to colder weather and water. My guess, you will be much happier in a 5mm open cell for water mid 60's and lower.
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