Here's what other sites are saying:
Slide on the Houdini Women's Alpine Alphies Bottom for the cold days on the hill. Its Alpha Base fabric stretches comfortably and has a soft cotton-like feel. The wicking finish keeps you dry when you work up a sweat, and the pH pure antimicrobial treatment prevents foul odors from building up in the baselayer. Houdini added Econ Stretch at the knees for added insulation that has excellent breathability and moisture management qualities. The combination of the tight fit and alpha seams reduces bulk, and the 3/4 length leaves just your socks in your boots for less bunching.