The Kensington Lifaloft Vest is a great all year round piece in any conditions, keeping you warm even when wet. Lifaloftâ„¢ 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, Lifaloftâ„¢ 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.