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 offer you the best products and services for motorcycle enthusiasts. From exclusive high-performance parts to tailor-made solutions — your riding experience is at the center of everything we do.
Shipping & Returns
Shipping & Returns
We ship with DHL and FedEx — if requested, also via express. If an item is in stock, shipping via express can, in many cases, be delivered within 1 business day. Standard delivery time is typically about 2–5 business days within the country, and worldwide usually about 1 week. Please check the available shipping options and transit times in the cart, as we offer several shipping providers depending on the country.
Returns must be registered in advance by email and are possible according to our return policy (14 days to request a return + 14 days return shipping deadline after approval). Please note: Unregistered returns will not be accepted. You can find all details on the terms, exceptions, and refunds in our return policy.
Your payment information is processed securely. We do not store any credit card details and we have no access to your credit card information.
More information in our FAQs
Write to our team via email – we’ll get back to you as quickly 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; in many cases it can even be shipped 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 carried out depending on the country and the selection, via DHL or FedEx.
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 receiving the item and, after approval, you have another 14 days to send it back.
Important: Unregistered returns are not accepted. All details can be found in our cancellation policy.
What does “delivery time on request” mean?
What does “delivery time on request” mean?
“Delivery time on request” means the item is generally not in stock right away and may need to be ordered separately. Please contact us before purchase – we’ll check availability and tell you 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, in many cases shipping can be completed within 1 business day (depending on the country and shipping option). You can see the available shipping methods in the shopping cart.
