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I have to force my wife to use the jacket! Can't see her using an I.S
I saw the suits that SMS had to offer, they did not seem to be comfi. Also did not like the price and the look.
I agree that a jacket alone is not enough, but still, an I.S for such a short trip? If you fly at 4000' you should be able to glide to the coast unless the engine gave up near the half way point. I don't know, you might have a point.