I use a 5 mil hood so that should be fine. I absolutely HATE the cold so if I'm good in that hood (yes, I know how that sounds), then just about anyone probably would be. As for suit, 5 mil is the MINIMUM but like others, I'd recommend a 7mm. I have a 7 mil and it keeps me warm. If it's warmer than normal, I just pull the neck out a touch and flood it. Cools me down in a hurry!! I was in Laguna last month and the water at 40 fsw was about 64 degrees and this method worked just fine. Better to have a thick suit you can flood to cool off than a suit that's too thin. No way to warm up a thin suit underwater.