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SIDI Rex Air Boots

The Rex Boot from SIDI, constructed of cooling, perforated Technomicro base material and thoroughly tested by SIDI's own Moto-GP riders, is a highly technical, class-leading sport boot.

Equipped with SIDI's exclusive Tecno-3 Push Closure System, the Rex Boots eliminate traditional buckles and laces. Instead, the boots are secured by three separate and adjustable steel cable closures. Each closure is comprised of a circular dial and push button that allows the dial's arm to be lifted and rotated for increased closing pressure.

Limiting lateral movements, the Rex Boots feature a single ankle support brace that combines with the internal and external ankle joint for additional support. Additionally, the bottom of the ankle brace is equipped with air vents which can be operated by an aerodynamic button. The Rex's toe slider also features an optional vent operated by a sliding mechanism located towards the front of the boot.


  • Perforated Technomicro base material
  • SIDI's exclusive Tecno-3 Push Closure System
  • Elastic panels in the front and rear of the boot in flex areas for maximum comfort
  • A single ankle support brace, nylon material infused with fiberglass fibers, joins the internal and external ankle joint for more support
  • The exterior ankle support brace is equipped with air vents
  • Small ventilation slots at the center of the support brace
  • Nylon inner sole with removable arch support pad
  • Double stitched in all high stress areas
  • Fully encapsulated heel cup
  • Lined with anti-abrasion Cambrelle in the foot area for comfort
  • Perforated Teflon treated nylon lining
  • Toe slider comprised of nylon reinforced with fiberglass and fitted with an air intake and an innovative alloy insert
  • Dual compound sole
  • DuPont® polymer toe shift pad
Product Style Item # Manufacturer Product # Availability
5.5/39 / White/Black 1539410 SISREAWHBK39 Out of Stock
6.5/40 / White/Black 1539411 SISREAWHBK40 Out of Stock
7.5/41 / White/Black 1539412 SISREAWHBK41 Out of Stock
8.5/42 / White/Black 1539413 SISREAWHBK42 In Stock: Ships within 24 hours
9.5/43 / White/Black 1539414 SISREAWHBK43 Available: Requires 3-5 business days of lead time prior to shipment
10/44 / White/Black 1539415 SISREAWHBK44 Out of Stock
11/45 / White/Black 1539416 SISREAWHBK45 In Stock: Ships within 24 hours
11.5/46 / White/Black 1539417 SISREAWHBK46 Only 2 Left: Ships within 24 hours
12.5/47 / White/Black 1539418 SISREAWHBK47 Only 1 Left: Ships within 24 hours
13/48 / White/Black 1539419 SISREAWHBK48 Out of Stock