R-Core Concept is applying experience while redefining standards to yield different results. When every split-second counts, an aerodynamic fit can make that difference. When paired up with the R-Core X pant, the R-Core Concept combo offers maximum mobility in the riding position. The two-piece unit starts with a poly/spandex long sleeve stretchable body topped off with a lightweight bib for an aerodynamic fit and increased ventilation with full range of motion. FEATURES Polyester/spandex jersey. Moisture management properties. Aerodynamic chassis. Screen printed graphics. Flat-locked seams to minimize chafing. Wear under the bib or as is.