Enjoy Your Racing. The MAV Jacket has been engineered from a tough yet lightweight 3L Gore-Tex laminate to be part of the ultimate racing system for keel boat racers who demand performance. Offering the highest levels of breathability, durable waterproofness, lightness and great freedom of movement, it allows you to focus on what's important. 1. Engineered from rugged and durable Gore-Tex Pro. 2. YKK Aquaguard Zippers . 3. Stripped back design for optimum performance to weight ratio.