The Reactor II is engineered for performance in a value driven package. A fresh combination of stretch and durability. Fresh colors and graphics with style that's built to last. 1mm UltraFlex/FluidFlex2 Neoprene Combination Washing instruction: Rinse with cool water and drip dry out of direct sunlight FLUIDFLEX™ NEOPRENE A category of high stretch neoprene with an ultra soft hand and insane affordability. Stretch factor: 100% FLATLOC STITCHED The most popular method of sewn construction. The stitch uses 4 needles and 6 threads, and works by overlapping the neoprene panels and sewing them together. It is a strong stitch and is very comfortable because it is flat, but it is not a sealed seam so it is not intended for extremely cold conditions.