The TNF Terra Peak men's mid-season jacket delivers lightweight warmth whenever you need it. It features a ThermoBallTM Eco insulation which is made from recycled polyester to keep you warm even when wet on winter hikes and other outdoor pursuits. This jacket can be worn as an insulating layer under your go-to shell or as a wind-resistant standalone in dry conditions providing comfort and warmth during your outdoor activities. And when it is time to stow it away, you can fold it into its chest pocket for easy carrying. This mid layer will be quite useful in an onion layering system, made of three types of clothing. The first layer, worn next-to-skin will provide warmth and quickly move moisture away from your skin. Then, the second layer, is the insulation or fleece, that provides warmth while also dissipating heat during periods of high output. And finally, the third layer, the shell, which is the most weather-protective layer, worn on the outside of all other layers.