FNDN Heated Skin-Fit Base Layer: These days, having a closet consisting of cutting-edge capability is the name of the game. We';ve designed a heated, skin-fit base layer that is made from an extremely lightweight, breathable, stretch technical fabric. The long sleeve, hooded base-layer with thumb hole cuffs is so versatile it can be worn under your favorite shirt, sweater, jacket or simply by itself to provide enough warmth as a parka jacket without the restricting bulkiness. Control every zone with this heat-on-demand base layer.FNDN soft-touch control buttons are capable of providing you with three different levels of heat in multiple heated zones. Stemming from your hands, back of your neck, then throughout the upper and lower back regions.No matter if you work or play outside in the winter temps, turn to the Foundation Heated Base Layer for all day heated comfort.The unisex cut is designed to fit both Men and Women. Please see our sizing chart to determine the best fit for you.Winter Is Coming, We Are Ready.Features:Moisture wicking, breathable stretch fabric with heated back, hood and thumb hole cuffsFully machine washable (Must Remove Batteries)4 Radiant-X Core Heating Levels including High, Med, Low & ""Smart Pre-Heat""6-hour continuous run timeSmall & Lightweight high-performance BEGO Battery SystemUniversal USB ChargingFabric: Front: 90% Polyester, 10% Spandex; Back: 65% Polyester, 25% Cotton, 10% SpandexFNDN Heated Skin-Fit Base Layer Includes:1 Skin-Fit Heated Base Layer long sleeve top with hood and thumb hole cuffs2 3.7V Li-Ion Rechargeable ""BEGO"" Batteries1 USB Dual Battery Charging Cable*Smart Pre-Heat: Features a battery-saving ""Smart Pre-Heat"" mode. The pre-heat mode happens when initially turning the controller on. The LED is red, but will slowly flash red. The smart pre-heat occurs for the first five minutes and then automatically kicks to medium to save battery. You can bypass this level by simply pressing the button again.Battery RUN Times:High - Red - 158 minMed - White - 221 minLow - Blue - 420 minCare Instructions:Machine Wash Delicate (Remove Batteries)Use No BleachDo Not Machine DryDo Not Iron"