Sidi Crossair Motorcycle Boots Red/Black 105 – MX & Enduro Boot
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Size chart Sidi Motorcycle Boots

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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- 14-day returns — in stock ships within 24h
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We ship with DHL and FedEx — express on request. If an item is in stock, express delivery can often go out within 1 business day. Standard delivery takes about 2–5 business days domestically and usually around a week worldwide. Please check the available shipping options and delivery times in your cart, as we offer several carriers depending on the country.
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 motorcycle boots in red/black set the bar higher. Used by pro riders across MX, hard enduro and super enduro, the Crossair delivers all the solidity of a premium Sidi boot at just 1,665 grams (size 43) — far lighter than anything else. An internal fibreglass-reinforced exoskeleton provides full support and safety in an incredibly light construction, while the Materiis sole compound, developed with professional riders, reaches a new level of grip and durability.
Key Features
- Internal fibreglass exoskeleton delivers pro-level support and safety at just 1,665 g (size 43)
- MXGP- and SX-engineered microfibre with protectors on the front, side and toe, plus a thermoplastic defender toe area
- Anti-hyperextension system supports the whole leg while protecting against excessive movement
- Velcro closure with a micro-adjustable, replaceable buckle system for a solid, individually fitted hold
- Hinge system, anatomic heel cup and replaceable metatarsus insets for protection and freedom of movement
- Materiis exclusive compound sole — MXGP- and SX-proven grip and durability
The Lightest Pro Boot Ever
How do you make the lightest pro boot ever? You build it 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 anti-hyperextension structure supports the entire leg of the boot while preventing dangerous ranges of movement — so you stay in control and free to move. Combined with the hinge system and anatomic heel cup, it protects without ever feeling restrictive across MX, hard enduro and super enduro.
Materiis Exclusive Compound
Developed together with professional riders, the Materiis sole compound reaches a new level of grip and durability. MXGP- and SX-proven, it delivers the traction and longevity that competition demands, ride after ride.
Fit and Sizing
The Sidi Crossair is offered in a regular fit across EU sizes 37–50. 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 |
| Model number | 105 |
| Colour | Red/Black |
| Type | MX / hard-enduro pro boot |
| Upper material | MXGP/SX-engineered microfibre |
| Protection | Front, side & toe protectors; thermoplastic toe defender; anti-hyperextension; fibreglass exoskeleton; anatomic heel cup |
| Closure system | Velcro + micro-adjustable replaceable buckles |
| Weight | 1,665 g (size 43) |
| Sole | Materiis exclusive compound (MXGP/SX proven) |
| Replaceable components | Buckles, metatarsus insets |
| Fit | Regular |
| Intended use | MX, hard enduro & super enduro |
| Available sizes | 37–50 |
| Brand | Sidi |
|---|---|
| Model | Crossair |
| Model number | 105 |
| Colour | Red/Black |
| Upper material | MXGP/SX-engineered microfibre |
| Protection | Front, side & toe protectors; thermoplastic toe defender; anti-hyperextension; fibreglass exoskeleton; anatomic heel cup |
| Closure system | Velcro + micro-adjustable replaceable buckles |
| Weight | 1,665 g (size 43) |
| Sole | Materiis exclusive compound (MXGP/SX proven) |
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// Sidi
Sidi Crossair Motorcycle Boots Red/Black 105 – MX & Enduro Boot

Tech specs
- Brand
- Sidi
- Model
- Crossair
- Model number
- 105
- Colour
- Red/Black
- Upper material
- MXGP/SX-engineered microfibre
- Protection
- Front, side & toe protectors; thermoplastic toe defender; anti-hyperextension; fibreglass exoskeleton; anatomic heel cup
- Closure system
- Velcro + micro-adjustable replaceable buckles
- Weight
- 1,665 g (size 43)
- Sole
- Materiis exclusive compound (MXGP/SX proven)
- 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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