Combination of 6 different neoprene qualities regarding thickness, elasticity and surface. Flat AIRCELL 3.5mm structure on the front side for maximal flexibility and body rotation. 2mm Neoprene on frontal lower legs and knees for supporting stronger leg kicks. Light neoprene 1 mm neoprene at the torso side area; 1.5 mm neoprene at the shoulder area ; thinnest 0.5 mm neoprene on lower arm area. Available in women’s and men’s models.