FNDN Heated Skin-Fit Base Layer In today's day and age, 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 center back regions. FNDN Heated Skin-Fit Base Layer In today's day and age, 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 center back regions. Features: Moisture-wicking, breathable stretch fabric with a heated back, hood, and thumbhole cuffsFully machine washable (Must Remove Batteries)4 Radiant-X Core Heating Levels including High, Med, Low & “Smart Pre-Heat”4-6 hour continuous run time with the 2 included batteries, with the ability to add 2 more bego batteries (4 total) to double the run time.Small & Lightweight high-performance BEGO Battery SystemUniversal USB Charging . . . FNDN Heated Skin-Fit Base Layer Includes: 1 Skin-Fit Heated Base Layer long sleeve top with hood and thumbhole cuffs2 - 3.7V Li-Ion Rechargeable “BEGO” Batteries (you can add two more to increase run time)1 USB Dual Battery Charging Cable Fabric: Front: 90% Polyester, 10% Spandex; Back: 65% Polyester, 25% Cotton, 10% Spandex Care Instructions: Machine Wash Delicate (Remove Batteries) Use No Bleach Do Not Machine Dry Do Not Iron Moisture Wicking Fabric Heat on Demand To Back, Neck, & Head Heated Hand Cuffs Battery Life 4.5 - Hours Comes with USB Dual Charging Cable