Warm Cute Womens Belly Wrap with Easy Rib Material Asahi Kasei uses Thermogear "Thermogear" material with hygroscopic heat-generating material that is thin but warm. Slim rib material Stretches well to fit your body. Length: Approx. 12.2 inches (31 cm) warm item to warm your body and aim for the base body temperature of 14.2 °F (36.5 °C).