Here's what other sites are saying:
Running in the winter requires dedication and excellent protection from slush, snow, and cold - that's why you love The North Face's Ultra Onesie to keep you up and running. Designed from the inside out, the men's specific body mapped fabrics and venting layering system to wick away moisture where you need it the most: your lower back & sides, behind your knees, under your arms, and your neck. The attached scuba hood provides extra protection while providing ear-hole ventilation and additional hearing ability.
- Mountain Gear refers to the men's version
You're a running, cross-training, and skiing machine, and The North Face Ultra One Piece is your tool of choice to stay comfortable on trail and in the mountains. Wear it on its own when the outside temperature is cool or layer it under a shell when the weather turns brutal.
- Backcountry.com refers to the men's version