Warm layer technology is a must if you are playing winter golf. There is nothing worse for your game if you are not warm & comfortable. The new Doug jacket from Galvin Green benefits from their Insula technology. The fabric used is 90% Polyester/10% elastane which gives a soft, stretchy & comfortable feel. It also contains air chambers within the fabric that retains body heat. This gives an extremely effective layer of insulation which maintains the heat that is generated to provide an even regulated temperature even when the weather turns cold. The fabric is also highly breathable so comfort is maintained throughout your round.