I posted the comments below back in 2002. I'm a lazy man, so I'm gonna just cut-and-paste...

I will add that my opinion of this product has remained very high. It is great stuff. Not sure if it is still available though:
The most valuable piece of cold weather gear that I have found is the Power Stretch Union Bib that I got from Cabelas a few years ago. In the past, I usually bought wool and polyester blend two-piece long johns from Farm & Fleet or something similar that was on sale. So, I was a little hesitant to pay $90 for a pair of drawers. I have to say that the Union Bib is worth every penny, and I have since bought a second pair.
I haven't tried many high tech fabrics, so this product was a big step up in comfort and warmth for me. Because it is one piece, there is no annoyance from the upper part coming untucked or bunching up. Because it is a bib, not a full upper, the freedom of movement for the arms is excellent. The material that it is made from is warm, wind-resistant, wicks away sweat, and is comfortable against the skin. After extensive use, the material has not stretched out of shape, become baggy, or torn. It has remained form-fitting but stretchy.
There are only two downsides that I can think of. The first is the initial price. The second is that I have to wear a light pair of shorts underneath. The metal zipper ends right at the crotch, so chafing and scratching can occur.