Review on Long-Lasting World-BIO Body Warmers: Disposable Patch with Adhesive Backing for Hours of Warmth - 5/10/12/17/20/32/40 Packs, Foot & Hand Warmers, Safe Natural Odorless Air Activation by Ray Gist

Some Scouts thought they could get the badges they needed while backpacking and their Scout Master couldn't talk them out of waiting until the nighttime temperature rose above the expected 20F. I reached the climax of madness when I offered to help him. I've hiked a lot and often hiked in cold weather, but never in this combination. My 35F touring bag needed a boost and the fleece lining, heavy sweats and this insulation did it. With two heating pads on my feet and one on my chest, I was quite comfortable in a potentially awkward situation. (The boys did well, but still learned that the Scoutmaster knew what he was talking about.)