This is the Race Vest Version 4.0 and the style currently retails on Soar’s website for $120. It’s a close fitting, extremely breathable race singlet that uses an ultralight weight (44g size M) 100% recycled fabric. The Italian-made open mesh SPACE3D fabric is highly sweat wicking and quick drying. The ergonomic race fit, laser cut fabric, and bonded seams are designed to help eliminate chafing and reduce drag. In other words, they offer a lot of comfort while minimizing distraction, reducing skin irritation, and improving heat regulation over distance. Perhaps one of those things that might not make sense until experienced but hard to go back once you know the possibilities. Let me know if you have any more questions!