Aeance - Innovative bionic C change® membranes in the Swiss-made waterproof four-way stretch fabric of AEANCE's navy Adaptive performance jacket work so the level of breathability adapts to weather conditions and body temperature. Bonded taped seams are used throughout, and the contrasting cream layered chevron panels conceal laser-cut perforations for ventilation on the back. The fit is slim and true to size.