Our Solid Jammer is constructed of Xtra Life lycra for added strength and maximum support. Designed to combat the "bag and sag" of traditional swimwear, the 1500 Solid Jammer, delivers a long lasting fit that allows this swimsuit to stand up to the toughest workouts. Male front lined, The Xtra Life lycra Jammer resists chlorine and other pool chemicals 5-10 times longer than unprotected elastane. 80% Nylon/20% Xtra Life lycra Fiber.