Dual Control Heating – Power front, back, or both zones separately with 3 heat zones. Targeted heat on neck, chest and back. Up to 9 Hours of Heat – Long-lasting warmth on a single charge with 3 heat settings. Low, medium, or high for each zone. Machine Washable – Easy care (remove battery before washing). 10,000 mAh Battery + USB Charging Cable Included – Rechargeable power (charger block not included). Flexible & Lightweight – Slim fit perfect for layering. Conquer the cold with confidence. The Gobi Heat FlexCore Men’s Heated Base Layer Shirt features dual control technology, giving you the power to heat the front, back, or both zones independently. With three targeted heat zones across the neck, chest and back and three heat settings, you’ll enjoy warmth your way—whether you’re working outdoors, hitting the slopes, or braving a freezing commute. Designed for layering or wearing solo, this slim, flexible shirt delivers up to 8 hours of warmth from the included 10,000 mAh rechargeable battery. Built for performance, comfort, and versatility, FlexCore is the essential heated base layer for winter.