Warm enough to wear alone and thin enough to layer, the Heatwave glove liner provides a base layer that drastically changes how you feel in the cold. The revolutionary dual heating system found in the Heatwave lining reflects and amplifies your body's heat to produce that warm cozy feeling we all look for in a glove. Reflective Heat, Amplified. Thermal Reflective stage - up to 20% warmer. Kinetic stage - Amplifies Temperature 4-5deg.Recommended for: wearing alone on cold days or layering for extreme warmth. | Seirus Heatwave Glove Liner in Black | Size Small/Medium