It's the struggle for anyone exercising in the cold weather – you want a jacket that keeps you warm but doesn't cause you to overheat once you start to sweat. Most jackets will do a fine job retaining heat when you're standing still, but releasing all that excess heat becomes a problem. In The North Face's new Ventrix jacket, it has come up with a new technology to help solve the dilemma.
Many high-end jackets targeted at aerobic athletes have what is called active insulation, which helps warm air escape. What makes the Ventrix jacket different is that the outer layer features hundreds of tiny perforations. They remain closed when you're idle, but as you heat up, they open up like tiny vents to help the hot air escape. The jacket, which comes with or without a hood, features a durable water repellant coating to keep you dry, and the material is designed with stretch characteristics that provide a wide range of motion. It's an expensive jacket designed for elite athletes, but anyone spending time in the outdoors in cold weather can certainly benefit from this new technology.