I carry a couple of those small heating packs with me on most mountain hikes or skiing trips, in case of "emergency", mostly in case my son gets cold hands. He's skinny and takes a while to warm up. I'm not happy with the idea of using them on a regular basis either, but they're great to have in your pocket just in case.
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett