The ButtVest is soft and plush—inspired by Woobie poncho liners used by the U.S. military—with 60 gram insulation, a waterproof seat and a taped center seam to keep your butt warm and dry, whether you're on a cold skid steer, an ATV, or up in a tree stand. It's also got full two-way side zips for easy on/off and venting, and a full front zip for bathroom breaks. And as part of our integrated workwear system, the ButtVest is designed to layer perfectly over any of our T-line pants and bibs.