I agree - I have a superstretch outside/open in and it is an incredibly durable suit. 3mil smooth out/open in will be very fragile - nylon (superstretch is a very flexible nylon) out is a much better investment for a 3 mil. Without it there is a very good chance you'll blow the suit out. Elios actually advised me against the smooth out/open cell in combo in a 3 mil.
The only reasons for smooth out are that it is much warmer in air when wet and has a little bit less friction. For training you are better off getting a sturdier suit.
|