Le Col Pro Short Sleeve Jersey Unisex. The Le Col Pro Jersey is our fastest summer layer. Developed and proven in the pro-peloton, it�s refined race fit has been crafted and wind tunnel tested to make it the most aerodynamic jersey Le Col has ever produced. Using a premium four-way stretch fabric, the Pro Jersey offers support, and remains strong thanks to a flat-lock seam construction. Using silicone hem and sleeve grippers for a metered and stable fit, the jersey uses an ergonomic cut collar for better comfort on the bike.