VentureHeat Evolve Unisex-Adult 5V USB Power Bank Battery Heated Hoodie (Black, X-Large) 3 heat element panels locations: 1 on the back and 1 on each chest provide adjustable heat to core body areas Includes a built-in temperature controller with 3 heat settings: Hot, medium, and low 50% mesh cotton 50% polyester outer layer and plush fleece lining to promote natural warmth The hoodie is built to compatible with most 2.1 amp power banks on the market Machine washable and dryable