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For super cold waters, go with an O’Neill Psycho Freak 4.5/3.5MM Wetsuit.
It’s double lined, XDS-Air neoprene will keep you toasty and dry in almost any situation, and it’s insanely flexible where you need it most.
Throw in an external key-pocket, D-Tox knee pads, plasma seals, a drain hole, and a double Superseal neck, and you’ll see why I can call the O’Neill Psycho Freak 4.5MM Wetsuit the last one you’ll ever buy for cold water surfing. (more . . .)