Motocross boots Crossair HDEND

A boot that pushes the limits. Developed and used by professional hard enduro rider Billy Bolt.

The Crossair HD is the world's first boot specifically designed for hard enduro and super enduro disciplines. It offers all the sturdiness of a high-end boot Sidi, weighing only 1700 grams (size 43), much lighter than all the others. A reinforced internal exoskeleton made of fiberglass provides complete support and safety while maintaining an ultra-light structure. Its rubber sole is directly stitched to the upper, with a design and compound derived from trial boots. This allows the boot to be lightweight, protective, and offer unrivalled grip, whether on footpegs or across all types of terrain encountered in hard enduro.

The Crossair HD is the result of relentless engineering aimed at creating a product that meets all of Billy's requirements and the needs of the discipline. It embodies the perfect fusion of Billy Bolt's distinctive style and the craftsmanship of Sidi.

• Shin plate
• Velcro closure
• Replaceable micro-adjustable buckle system
• Anti-hyperextension system
• Articulation systems
• Calf zone
• Anatomical heel cup
• Replaceable metatarsal inserts
• Thermoplastic reinforcement at the front of the foot

// FULLY ARMOURED

How did we design the lightest pro boot? By building it around an internal fiberglass exoskeleton, providing the necessary safety and support for extreme riding in a lightweight structure. The integrated anti-hyperextension system supports the entire leg and protects against excessive movements.

// THE LIGHTEST OF THE PROS

The Crossair is the lightest pro rider boot in the world. Thanks to its fiberglass construction, it provides all the support and protection needed without the weight.

// PROTECTED AGAINST DANGEROUS MOVEMENTS

Our anti-hyperextension structures are designed to follow movements while preventing excessive angles, so riders can maintain control while staying free to move.

// ULTRA-THIN INTERIOR FOR BETTER CONTACT WITH THE BIKE

A thin inner panel ensures better contact with the bike and enhanced feel.

// BUILT TO LAST. IT'S A SIDI

Good products last. That's why we use the best materials and make all parts interchangeable, so you can keep your favourite pair as long as you want.

// HARD ENDURO SPECIFIC SOLE

The hard enduro specific sole ensures optimal grip and stability.

// ADVANTAGES

• MICROFIBRE DESIGNED FOR HARD ENDURO: Ready for the extreme
• PROTECTION AT THE FRONT, SIDES, AND TOE: Enhanced shock protection
• ULTRA-TOUGH BUCKLES: Secure hold and custom fit
• HARD ENDURO SOLE: Guaranteed grip in all conditions

Collection: 2026

Range: Crossair HD