Hyperflex Wetsuits Men's Polyolefin 50/50 L/S Rash Guard Polyolefin Made of 50 percent Neoprene 50 percent Polyolefin Polyolefin has the highest insulating capacity of any fiber, natural or man made for max warmth Polyolefin is an extremely lightweight material for ultimate comfort Rinse with cool water, do not dry in direct sun light, dry in the shade Made in China