The Jessica Storm repellent lightweight ‘heat-tech’ active Jacket is part insulated with recycled synthetic fibres that are lightweight, water-resistant, and, most importantly, very, very warm! (Focusing on the front, shoulders &back neck where most upper body heat is lost) With a super stretch fleece back designed to keep your core warm but enable you to swing with ease and remains comfortable on or off the course. Folds neatly away for storage.