Sidi Crossair HD Motorcycle Boots Black 372 – Hard Enduro Boot
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To determine the correct shoe size: please measure the length of the foot in cm, from the heel to the big toe, as shown in the image.

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Returns must be registered in advance by email and are possible in line with our cancellation policy (14-day return request + 14-day return window after approval). Please note: unregistered returns are not accepted. You'll find all details on conditions, exceptions and refunds in our cancellation policy.
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The Sidi Crossair HD motorcycle boots in black set the bar higher. Developed and raced by professional hard-enduro rider Billy Bolt, the Crossair HD is the world's first boot designed and built specifically for hard-enduro and super-enduro. It delivers all the solidity of a premium Sidi boot at just 1,700 grams (size 43) — far lighter than anything else — thanks to an internal fibreglass-reinforced exoskeleton that provides full support and safety in an incredibly light construction.
Key Features
- Internal fibreglass exoskeleton delivers pro-level support and safety at a class-leading 1,700 g (size 43)
- Unique 3-point anti-hyperextension system supports the leg while preventing dangerous movement
- Hard-enduro engineered microfibre with protectors on the front, side and toe, plus a thermoplastic defender toe area
- Velcro closure with a micro-adjustable, replaceable buckle system for a solid, individually fitted hold
- Anatomic heel cup, replaceable metatarsus insets and a hinge system for protection and freedom of movement
- Hard-enduro-specific sole — derived from Sidi trial boots and stitched directly to the upper — for unparalleled grip
The Lightest Pro Boot in the World
How do you build the lightest pro boot ever? Around an internal fibreglass exoskeleton that offers the safety and support extreme riding demands in a lightweight structure. Nothing else delivers the same riding experience: all the support and protection racing requires, without the burden of weight.
Protected from Dangerous Movements
The incorporated 3-point anti-hyperextension structure supports the entire length of the boot while preventing excessive, dangerous degrees of movement — so the rider stays in control and free to move. Combined with the hinge system and anatomic heel cup, it protects without ever feeling restrictive.
Trial-Derived Grip and Bike Feel
What makes the Crossair HD truly special is a sole whose design and composition are derived from trial boots: lightweight, protective and grippy both on the footpegs and in contact with any terrain hard enduro throws at you. An ultra-sleek inner panel brings you closer to the bike for greater contact and feel — the perfect fusion of Billy Bolt's style and Sidi manufacturing expertise.
Fit and Sizing
The Sidi Crossair HD is offered in a regular fit across EU sizes 39–50. If you ride in thicker socks or sit between sizes, we recommend sizing up. Consult the Sidi size chart before ordering to confirm the best fit.
Specifications
| Brand | Sidi |
| Model | Crossair HD |
| Model number | 372 |
| Colour | Black |
| Type | Hard-enduro / super-enduro boot |
| Signature | Billy Bolt |
| Upper material | Hard-enduro engineered microfibre |
| Protection | Front, side & toe protectors; thermoplastic toe defender; 3-point anti-hyperextension; fibreglass exoskeleton; anatomic heel cup |
| Closure system | Velcro + micro-adjustable replaceable buckles |
| Weight | 1,700 g (size 43) |
| Sole | Hard-enduro-specific sole (trial-derived, stitched) |
| Replaceable components | Buckles, metatarsus insets |
| Fit | Regular |
| Intended use | Hard enduro & super enduro |
| Available sizes | 39–50 |
| Brand | Sidi |
|---|---|
| Model | Crossair HD |
| Model number | 372 |
| Colour | Black |
| Upper material | Hard-enduro engineered microfibre |
| Protection | Front, side & toe protectors; thermoplastic toe defender; 3-point anti-hyperextension; fibreglass exoskeleton; anatomic heel cup |
| Closure system | Velcro + micro-adjustable replaceable buckles |
| Weight | 1,700 g (size 43) |
| Sole | Hard-enduro-specific sole (trial-derived, stitched) |
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// Sidi
Sidi Crossair HD Motorcycle Boots Black 372 – Hard Enduro Boot

Tech specs
- Brand
- Sidi
- Model
- Crossair HD
- Model number
- 372
- Colour
- Black
- Upper material
- Hard-enduro engineered microfibre
- Protection
- Front, side & toe protectors; thermoplastic toe defender; 3-point anti-hyperextension; fibreglass exoskeleton; anatomic heel cup
- Closure system
- Velcro + micro-adjustable replaceable buckles
- Weight
- 1,700 g (size 43)
- Sole
- Hard-enduro-specific sole (trial-derived, stitched)
- Worldwide shipping
- Genuine parts & verified quality
- 14-day returns — in stock ships within 24h
- Personal email support
// Support
Frequently asked questions
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