Boarderguy
Chief Narctopus Wrangler
I dive 50-55° routinely and a 7mm semi-dry does the trick for 1 hour dives. I could "get by" with a 3 or 5mm but I don't like shivering during or after a dive and especially don't like thumbing a dive when i have plenty of gas still. I do know that when I use a scooter in the same water I get chilly after about 45 minutes. When fining the entire time I'm good.