Sidi’s top AMA riders celebrate Sidi’s 5oth anniversary at Barber Motosports Park. At next weekends AMA finale at the Barber Motosports Park Sidi’s top riders in the USA will be wearing a special and very limited edition boot to help to celebrate Sidi’s 50th anniversary. The attached image shows the very elegant Sidi Vortice boot that Josh Herrin, Geoff May and Aaron Yates will use in Alabama and then place on their trophy shelve.