I like my casco warp. US bought a few years ago. Short tail aero helmets seem to have become the standard for track sprint events and I'll assume the World Cup racers are using them because they test faster. Kask Bambino is popular. The OGK KABUTO Aero SL Sprint appears to be vapor for all but elite and wealthy. I bet you'll see the Catlike Rapide on a number of heads this year. Mine included.