100% Nylon, please order a size up for best fit as the vest runs a bit slim. Imported 30% Larger Heating Areas: Topdot heated vest features 8 heating zones, which means 30% larger heating panels compared with other ordinary women's heated vests. High-quality carbon fiber heating elements generate consistent heat across the neck, shoulder, back, belly and waist for all-area warmth, promote blood circulation. Dual switch control the Upper (neck, shoulder) and Lower (back, belly & waist) heating elements respectively. Quick and Long-lasting Warmth: Fast heating in seconds with included 7.4V 14000mAh UL/CE-certified battery, which offers up to 10 hours of warmth on a single charge. 3 heating levels allows you adjust the temperature according to your needs in different environments, operates up to 9.5-10 hours (Low/ 104°F), 5-6 hours (Medium/ 122°F), 3.5-4 hours (High/ 140°F). For All Occasions: A great addition to your wardrobe! Our womens heated vest is perfect for going hiking fishing hunting cycling, walking your dog in the cool fall days, tailgate party before your favorite baseball team, the daily commute or even in a way-too-cold office. This vest is lightweight and warm enough for the fall and winter season, and looks good as an everyday piece over a long sleeve shirt, sweatshirt or sweater. Easy Care & Buy Risk-Free: Machine washable, safe and easy to clean, please remove the battery before washing