Balancing the needs of buoyancy with flexibility, Zoot designed the Z Force 3. 0 with varying thicknesses of Yamamoto C39 neoprene. The front body is made of a 4 millimeter layer of this neoprene, falling within the IFR maximum allowance of 5 millimeters. Why C39 neoprene' It's the industry leader in both stretch and buoyancy, and it has the second highest cell density of any neoprene on the market, providing added lift, especially panels with thicker neoprene. Known as Zoot's Aqualift system, thicker neoprene through the seat and torso raises your legs and torso in the water for increased power and speed. Ultimately, this added lift opens up your body for an ideal stroke position in the water and reduces drag by minimizing submergence. Further increasing the suit's hydrodynamics, the Super Composite Skin SCS is a hydrodynamic coating that increases swimming speeds by reducing overall drag for maximum efficiency. Helping you move quickly and without restriction through the water, Zoot decreased the arm's neoprene thickness to 2 millimeters. Furthermore, Zoot optimized the leg's neoprene thickness for an ideal balance of flexibility and body positioning. The front of the legs features 4 millimeter neoprene, while the back legs are slightly thinner, with 3 millimeter neoprene. Plus, the leg's Optimal Kick Design uses anatomic patterning for increased kick velocity, frequency, and efficiency. Providing a smooth feel and tight seal, Zoot added a single layer comfort neck closure for a low profile seal that keeps out water and eliminates chafing. Further enhancing the suit's performance in the water, the Dorsalflex Zipper and Glideflex grooved chest panel improve stretch for unrestricted lung expansion and full flexibility, as demanded by rigorous swimming.