Designed with the avid winter outdoor person in mind, the Smart Thawdaddy 2.0 Heated Base Layer Vest provides hours of additional warmth to your core with it's no bulk compact design fitting nicely under any jacket, shirt or hoodie. A front zippered closure design and lightweight 7.4volt Powersheer rechargeable Lithium-Ion battery provides up to 135°F of heat to a series of micro coil heat zones, making for an ideal base layer option for the toughest winter conditions. Toggle through 4 temperature settings without opening your jacket and right from your cell phone using Bluetooth control with the MW Connect app. The Mobile Warming Smart Thawdaddy Vest, a perfect fit for any cold weather activity, will keep you warmer and outside longer.