The Cirque Vest fills an important niche in your system as a breathable insulator for use as weather-resistant outerwear or as insulation underneath a shell to provide warmth where you need it most without sacrificing breathability or mobility.TechnologyPertex Quantum uses a tightly woven structure to provide a light and soft fabric that allows insulation to fully loft while also being quiet, wind-resistant, lightweight and packable.For hunts requiring warmth, especially in cold and wet conditions, Primaloft Gold insulation is a go-to for technical performance. Engineered for a full spectrum of benefits to provide warmth without bulk resulting in freedom of movement for your activity. One of the main differences between natural down insulation and Primaloft is the ability to maintain warmth when wet.