Fieldsheer Women's Merino Heated Base Layer Pants - Designed for versatility, wear this as a base layer to deliver unparalleled levels of warmth and safety. Heavyweight Merino Wool Base Layer; Multi-Zone Heat Elements: 2x Inner Thigh & 1x Upper Waist; Bluetooth Control with MW Connect available on Apple App Store or Google Play Store; Integrated Touch Control Button; 4 Selectable Heat Settings; Powersheer Standard 7.4volt Rechargeable Lithium-Ion Battery; Up to 10 Hours of Power Per Charge; Universal USB Charging; UL/CE certified; USB Cable included; Charge Time 3-4 hours; Style: MWWP21010;