Sidi Rex Air Motorcycle Boots White/Red 391
Sidi Rex Air Motorcycle Boots White/Red 391
Delivery time on request
To determine the correct shoe size: please measure the length of the foot in cm; starting from the heel to the big toe, as shown in the image.
Sidi Rex Air Motorcycle Boots White/Red 391 – Ventilation & Racing Protection at the Highest Level
The Sidi Rex Air Motorcycle Boots White/Red 391 are the perfect choice for all sport riders who expect top performance – even in high temperatures. This premium racing boot combines maximum breathability, highest safety standards, and a precise, individually adjustable fit.
Whether you're on the racetrack or riding sporty tours: This boot delivers the performance you need to safely push every limit.
Tangible More Airflow – Made for Hot Days
With its perforated microfiber material, the Rex Air ensures exceptionally high air circulation.
The result:
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Cooler Feet
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Less Moisture
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More Comfort on Long and Hot Rides
The integrated Air Ventilation System is positioned exactly where it has the greatest effect during sporty riding.
Pro-Level Safety with High-Tech-Protectors
Sidi relies on state-of-the-art safety structures for the Rex Air White/Red 391:
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High-quality TPU Impact-Protectors
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Fiberglass-reinforced Exoskeleton Structure for Maximum Stability
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Replaceable Shin Plate & Slider
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Asymmetrical Heel Cup for More Control
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Side-Slip Design for a Secure Contact Point with the Motorcycle
These technologies come directly from the professional realm – developed for maximum performance and safety.
Fit Like Tailored – Thanks to Dual-Dial System
With the innovative Dual-Dial closure, the boot can be adjusted to the millimeter.
Advantages:
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Optimal Pressure Distribution
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Firm, Yet Comfortable Hold
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Individually Adjustable on Both Sides
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Quick & Precise to Operate
The Rex Air fits perfectly – whether for narrow or more robust calves.
Comfort & Control in Sport Riding
The Rex Air combines stability with freedom of movement:
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Highly abrasion-resistant upper material
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Intelligently designed flex zones
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High control during shifting & braking
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Secure grip in every corner
A boot that provides precise, sporty feedback on every ride.
Sidi & Sustainability
Sidi is actively committed to the UN Sustainable Development Goals and continuously works to reduce its CO₂ emissions – for responsible production with a future.
Product Highlights
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Color: White/Red
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Model number: 391
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Perforated upper material for maximum breathability
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Dual-dial system for individual fit
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TPU-Protectors & fiberglass exoskeleton
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Replaceable sliders & shin guards
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Racing-level stability and safety
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Comfortable, precise & durable
Conclusion: The Perfect Racing Boot for Hot Conditions
The Sidi Rex Air motorcycle boot White/Red 391 is ideal for riders who need full performance in heat – without compromising on safety, comfort, or fit. A true high-end boot for demanding sport riders.
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About Us
About Us
Our passion for quality and innovation drives us to provide you with the best products and services for motorcycle enthusiasts. From exclusive high-performance parts to custom solutions – your riding experience is our priority.
Shipping & Returns
Shipping & Returns
We ship with DHL and FedEx – express shipping is available upon request. If an item is in stock, express shipping can often be done within 1 business day. The regular delivery time is approximately 2-5 business days nationally, and about 1 week internationally. Please check the available shipping options and times in the cart, as we offer multiple shipping providers depending on the country.
Returns must be registered in advance via email and are possible according to our cancellation policy (14 days return request + 14 days return period after approval). Please note: Unregistered returns will not be accepted. All details regarding conditions, exceptions, and refunds can be found in our cancellation policy.
Your payment information is processed securely. We do not store credit card data and do not have access to your credit card information.
More info in our FAQs
Write an email to our team – we will get back to you as soon as possible.
How long does it take to process my order?
How long does it take to process my order?
If the item is in stock, we usually process your order very quickly, often shipping it the same day.
Our processing times are Monday to Friday, 07:30–16:30.
Do you ship internationally?
Do you ship internationally?
Yes, we ship worldwide. Shipping is done via DHL or FedEx depending on the country and selection.
What is your return policy?
What is your return policy?
Returns must be registered in advance by email. You can request a return within 14 days of receipt and have an additional 14 days for the return shipment after approval.
Important: Unregistered returns will not be accepted. You can find all details in our cancellation policy.
What does 'Delivery time on request' mean?
What does 'Delivery time on request' mean?
'Delivery time on request' means that the item is usually not directly in stock and may need to be specially ordered. Please contact us before purchasing – we will check availability and provide you with the estimated delivery time.
Do you offer express shipping?
Do you offer express shipping?
Yes, we offer express shipping. If an item is in stock, shipping can often occur within 1 business day (depending on the country and shipping option). You can see the available shipping methods in the shopping cart.
