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The King is dead, long live the King!


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The Sidi Rex is the successor of the Vortice racing boot. With a new and improved closure system, large ankle support and air vents, the Sidi Rex is the ultimate racing boot. And it should be, as it's the direct result of "on the track" testing in MotoGP!



The King of racing boot used to be the Sidi Vortice. But to every era comes an end. Enter: the Sidi Rex. These new hardcore racing boots will give you everything you need if you're the type of rider who likes to beat the stopwatch, whether it's on the track or on your daily route to the office. The Rex was developed through research, laboratory tests and "on the track" testing thanks to Sidi's MotoGP riders' input. The Vortice has always been an exceptional boot, but the Rex takes it to the next level.

The Rex sports the new and improved closure system. The Tecno-3 Push rotors allow for easy adjustability with less hassle compared to the Vortice. The steel cables are now firmly attached to the boots and no longer rely on magnets to secure a good fit. The push button allows the rotating buckle to be lifted for an easy grip.. The whole system makes sure the shin and ankle mechanisms are closed symmetrically for a perfect, snug fit. The large ankle support brace joins the internal and external ankle joint for more support. In the outer lower part, you will find an effective air vent. On the calfs there's a large exhaust vent and on the toes you will find another intake vent. Sweaty feet are a thing of the past.

The Sidi Rex comes in multiple colors and in both non-vented and vented (AIR) versions.

Special features

  • Protection:Nylon and Fiberglass protective parts
  • Protection: Large ankle support brace for more support
  • Ventilation: Vents at the toes, calf and side of the foot
  • Ventilation: Perforated upper for maximum ventilation
  • Extra Information: New and improved closure system
Additional Information

Additional Information

Brand Sidi
Ventilation Air scoops, Perforated areas
Material Microfiber
Waterproof membrane None
Protection Ankle, Shin
Main Color Black
Sub Colors Black
Lifestyle Race/Sport
Boot Type Racing boot
Gender Men
Size Chart


EU 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
US Men 3-3.5 4-4.5 5-5.5 5.5-6 6.5-7 7-7.5 8-8.5 9-9.5 9.5-10 10.5-11 11-11.5 12-12.5 13-13.5 14 15
US Women 4.5-5 5.5-6 6.5-7 7-7.5 8-8.5 8.5-9 9.5-10 10.5-11 11-11.5 12-12.5 12.5-13