Seirus Therma-Lux Heat Pocket
Here's what other sites are saying:
Slip hand warmer packets into the dedicated pockets on the Seirus Thermalux(TM) Heat Pocket glove liners to keep your hands toasty on trips into frigid winter weather. Polyester/spandex gloves have a snug fit so they easily fit into a larger pair of gloves; material is designed to conduct heat and reflect it back to your hands. Pockets on the backs of the gloves stow hand warmer packets (sold separately).