The North Face Women's Thermoball Plus Hoodie was designed using PrimaLoft Thermoball synthetic insulation very similar to down. It is quick drying and very warm despite its light weight. The breathability is just as excellent as the ability of the fibres to still provide insulation when wet. This is a great feature, especially when you're involved in high-intensity activities in the cold, something which actually makes the Thermoball jacket more suitable. In addition, the shell's fabric is tough despite the fact that it's light and thin. The athletic design punctuates the function of the packable jacket, which can be worn as an outer layer on milder and cloudy days at home or in the mountains.