The response 1.5mm Flatlock vest uses Guls' titanium-2 lined neoprene designed to reflect the heat back in. the response vest is perfect for keeping the wind off your back. The main body uses long lasting, durable and flexible dura-flex neoprene that has been constructed with Fatlocked seams to ensure an increased lifespan. The response vest has been designed with a reversible climate control system: the black side for cold weather and the grey for hot weather. The response range meets all the requirements for the all-round watersports enthusiast.