The studies on the garment are being conducted in the PSE group to provide the most efficient drag reduction design for athletes based on cutting-edge CFD simulations. The flow field varies among different riders due to various figures and body postures. High-resolution CFD simulations can help visualize the wall shear stress from which we can locate the exact position where separation or reattachment occurs. For each flow region, the ad-hoc design can then be applied accordingly.