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