The Kensington Lifaloft Vest is a great all year round piece in any conditions, keeping you warm even when wet. Lifaloft is an insulation revolution that will keep you warmer with less weight and bulk due to the unique Lifa yarn technology. Developed in cooperation with PrimaLoft, Lifaloft is a combination of Lifa and PrimaLoft's extensive knowledge in synthetic insulation. Less carbon and water footprint vs comparable polyester for a lower environmental impact.