NexGen Heat NXL4301SET Ladies Puffed Black ‘Heated’ Textile Vest (Rechargeable Battery Pack Included)Features Made Of 100% Nylon Outer Shell Insulated with Taffeta LiningTaffeta Material Is a Crisp, Smooth, Plain Woven Fabric Made From Silk or Cuprammonium Rayons As Well As Acetate and PolyesterFront Zipper Closure2 Lower Outside Hand Pockets with Zipper ClosureFully LinedNexGen Heated Technology DetailsPower-On Button on Chest with NexGen Logo (Lights on When On) Heated Panels: Front and Back Heated Panels and 1 Heated Pad on the Back of the