About the technology. Ventrix™ is an innovative insulation technology that keeps your body warm without overheating, adapting to movement and regulating temperature. It pairs highly breathable fabrics with laser-perforated, stretch synthetic insulation.  The insulation is strategically placed in key zones and is anchored using darts, causing the perforations to open and close during motion. These perforations open when you move, allowing excess heat and moisture to escape, and remain closed during rest to retain warmth. Lightweight- warmth without bulk. Full range of motion for biking/skiing and skating. Experience the outdoors with this navy blue jacket. Designed for performance and comfort. Ideal for any adventure.. 3- seasons can be used under powder jacket skiing. The green is only for example. There are perforations under arms for air ventilation under arms.no rips or stains.