I got one of these from @bill7718 in the last Wootizen BOC Exchange. Pretty cool, er, hot!
The Lava Pad is a revolutionary, non-electric heating pad that can even be used underwater. Lava Pads provide the diver with INSTANT Thermal Heat, without electricity! With a simple snap of the fingers, a diver can activate the pad and slip it inside a wet or dry suit before entering the water. Lava Pads generate their own heat for 45 minutes of up to 130 degrees, helping you to feel warmer and more comfortable underwater. Since Lava Pads are reusable, fit snugly, non-toxic, 100% portable and require no batteries, assembly or power source to use, they are convenient for multiple dives and can be brought along and activated as needed!
Neck and Shoulder Pad: 15" x 11"