Henderson 3mm Women's Thermoprene Zippered Vest3mm Women's Thermoprene Zippered Vest Theres no better way to boost warmth than to add a vest to your exposure protection gear. Wear it with board shorts in tropical waters or layer it with any type of full length suit for cold water diving. Thermoprenes natural stretch, about 75 percent more than standard wetsuit material, also means that this vest is easy to slip into or to layer with another garment without feeling any uncomfortable suit squeeze.