No matter the conditions you can keep your hands feeling like they're in a warm and comfy cloud with the Heatwave+ Puff Pal Mitt. An amazingly comfortable interior is built around Primaloft and HeatLock insulation encased in a durable Stretch Twill shell. And with a GORE-TEX insert, it's guaranteed dry. To top it all off the Heatwave+ lining adds yet another level of warmth, so you can stay out in the elements longer than ever before. The revolutionary dual heating system found in the Heatwave lining reflects and amplifies your bodys heat to produce that warm cozy feeling we all look for in a mitt. Reflective Heat, Amplified. Thermal Reflective stage - up to 20% warmer. Kinetic stage - Amplifies Temperature 4-5. By both reflecting and amplifying heat emitted from your hand, you can stay warm without all the bulk.