Styled for the city, built for the clifftop. Providing unbeatable warmth to keep you out in the elements. Named after Fourier’s law of heat conduction, the Fourier Insulated Puffer Jacket is built to keep the warmth in while you’re out in the elements. Built with 100% recycled nylon, and it’s insulated with recycled insulation closely mimicking down whilst leaving the feathers with their rightful owners. Sustainable and built for a modern day workwear look.