The S7 is an alternative to the 3.8 for the Progressive Swimmer. This type of swimmer needs extra buoyancy, so the S7 was designed to elevate the position of the triathlete in the water without compromising elasticity when it comes to swim strokes. The perfect tool to make sure swimming doesn't slow you down.
The SCS coating on the neoprene, typical of high-end suits, reduces friction and helps to increase speed. Its micro-cellular structure repels water and creates less restriction when moving forward.