A must have layer for full-on winter conditions.

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.

Buy the Outdoor Research Saturn Suit at Altrec.com. Orders over $45 qualify for free shipping.