Designed with synthetic fibers that mimic downs lofty clusters, the Calor Vest from Gyde is made for cold weather conditions. The short staples are extremely airy and soft, while the continuous filaments are less compressible and more durable. Combining the two creates dense, warmth-trapping air pockets that are able to retain their shape more consistently over time. The insulation is packed into double layer baffles to help keep the fibers from escaping through the shell, and retain heat inside of the jacket. The outer shell features a water and wind resistant treatment to shed light moisture and the heated technology is a great way to stay warm all winter long.Each Battery has 4 settings and is indicated on the battery by a set of red lights:100% (4 red lights)75% (3 red lights)50% (2 red lights)25% (1 red lights)The 7v battery holds anywhere from 2 to 8 hours of heat, depending on the setting:2 hours at 100%3 hours at 75%5 hours at 50%8 hours at 25% Water-Resistant/ Windproof Outer Shell, 278g Synthetic Insulation, Four Microwire Heating Zones: Collar, Chest (2) and Back, Reaches Temperatures to 135 F, Equipped with Dual Mode 7 Volt Battery and Wall Charger, Slim Fit Design for Enhanced Warmth, Insulation Weight: 278g, Taped Seams: None, Battery Heated: Yes, Type: Vest, Jacket Fit: Slim, Length: Hip, Insulation Type: Synthetic, Waterproof: Water Resistant (< 5,000mm), Waterproof Zippers: No, Wind Protection: Yes, Water Resistant: Yes, Warmth Factor: Warmest, How Does This Fit?: True To Size, Windproof: Yes, Model Year: 2017, Product ID: 462588, Model Number: G0715M-351-301-10966, GTIN: 0811629022348