The N-Ferno 6495 Rechargeable Heated Vest features a battery power bank 7.2v/5000mAh and 4 heating zones around the neck collar, mid-back, and left and right chest for all-day warmth in cold to extreme conditions. This heated vest features 80g of insulation and serves as a low-bulk mid-layer option that traps body heat and fits comfortably under bulky winter jackets and gear.A wind-resistant polyester performance exterior provides protection from the elements and a fleece lining around the collar adds warmth for all-day use. The heated vest offers warmth without compromised mobility, featuring stretchable spandex blend on the sides for a comfortable fit.Unlike typical boxy and bulky winter gear, this lightweight vest is designed for a more athletic, snug fit to keep the heating zones close to the body for maximum warmth. This vest features an elastic bungee waist for a snug and adjustable fit that keeps cold air out and a zippered closure makes for easy on and off.