Outdoor Research Men's Saturn Suit:
This one-piece suit is ideal for winter mountaineering, backcountry skiing, or other activities in all-day cold. And you could do a lot worse under a dry suit. The full P-System zipper runs all the way up to the neck and has three sliders for convenient relief or excellent ventilation. The zipper is surface mounted for maximum comfort. Two large, surface-mounted, stretch-mesh front pockets provide tons of storage, which are especially useful when afternoon warming has caused outer layers to be shucked and the Saturn becomes outerwear for a while. To minimize bulk inside boots, the cuffs are made of thin, super-stretchy PowerStretch 50.