Altrec.com:

If you are in search of the perfect baselayer for Alpine & Mixed Route Climbing, look no further ; the Mountain Hardwear Power Stretch Suit for Men is the key to keeping warm and managing moisture on a multi-pitch climb or long summit bid. This one piece base layer will eliminate the draft between your pants and jacket and because it is made of Polartec PowerStretch, the Power Stretch Suit will fit close to your body, moving moisture away and insulating. The flat lock seam construction will prevent chafing and a 2-way front zipper and rainbow rear zip match most climbing bibs and pants.

BackCountry.com:

The Mountain Hardwear Mens Power Stretch Suit eliminates cold spots between your jacket and pants, and it offers full-coverage under hardshell bibs. The seams are flat locked, so they wont chafe or dig into your shoulders under a pack. The 4-way stretch material moves with your body for ice or alpine climbing. The Polartec fleece not only insulates but it moves moisture away from your skin to the fabrics surface, so you stay dry and comfortable. Mountain Hardwear overlaid the knees and all the seams, so theyll have more give and durability. The rainbow rear zipper matches most alpine climbing pants.