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Scuba Jerm:No way to tell without trying it first like Ed mentioned. However I can tell you I'm 5'10" 165lbs. I needed 25lbs of weight with a 7mm Farmer john. My Wife, who is 5'2" at 150lbs needed 29lbs. Hope that gives you an idea.
boulderjohn:[Scuba Jerm, you need to eat a few hamburgers!
ScubyDoo:I hate to get off topic here...but at 5-10, 165 Scuba Jerm is at ideal weight for his height, which is becoming ever more rare these days. Instead of him eating a few more burgers, I'd suggest others probably need to eat less. Proper fitness and health is afterall a major part of diving. Im 5-9, 155 and hope to stay that way as long as I possibly can.