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Article details
Sidi Rex Air, boots
Article No.: 11097917
When breathability is key, the Rex Air is the answer. Featuring a perforated upper for optimum ventilation, this boot combines all the features of Rex with a bonus. Every component of this racing boot has been designed to provide maximum protection. Worn by Sidi's Pro riders, Rex incorporates high grade TPU protectors and fiber glass reinforced nylon exoskeleton for invaluable support. The high-density resin dial system is engineered to provide a perfect fit while allowing the boot to be adjusted from either side. Strategically positioned on the outside of the contact areas, it has been integrated into the structure of the boot to provide impact protection for safety. Side-slip design for a secure ride.
Safety is not an option, and this boot takes the mission seriously thanks its supportive internal structure made of high grade TPU and fiber glass reinforced nylon exoskeleton.
The only boots that wrap smoothly the Tibia, thanks to its dual-sided adjustment. Made of high-density resin, our proprietary dialing system is made to last over time, and it is entirely interchangeable when times require it.
Designed for increased stability in the boot, Sidi's Firmor technology holds the foot at best, delivering incredible stability and control in any situation.
Sidi's unique closure system is engineered to sustain impacts, so that the boot holds its position during accidents.
In racing, sliding is the safest way to escape from an accident, as it prevents sharper forces from being channeled to the body. This is why Rex is engineered to support slide in case of an accident.
Features
- Perforated Lorica construction
- Dial closure system
- Teflon ventilated mesh insert
- Tecno calf tensioner for leg circumference adjustment
- Tecno Shin and Tensioner
- Fiberglass reinforced nylon ankle bandage
- Shock absorbing heel cup
- Replaceable shin plate
- Shift reinforcement
- Replaceable fiberglass reinforced nylon toe slider with aluminum insert and air inlet
- Polyurethane / rubber composite
- Racing SRS sole
- Certified according to EN 13634:2017
Customer reviews
You've had experience with the product?
Race but comfy!
Posted by Vojta 1 11.03.2026
Fit: Fits 1 size larger
I just received REX Air from SIDI without trying sizes and I am amazed from its comfort. My size is normally 46-47 but from reviews I read I decided to buy 1 size bigger so 48. The risk payed off. The boots are very comfy from what I expected from race boots, its flexibility in dorsal axis is amazing and lateral is more stiff and supportive. I can\'t wait to try to ride in hot summer and feel the perforation and vents but so far it was great deal. Sole is more sticky which I am not used but good grip is more safe for sure. Also SIDI is known for narrow feet but I normally wear barefoot and surprisingly Alpinestars SMXs are more squeeze than these SIDI. I love it so far!
I just received REX Air from SIDI without trying sizes and I am amazed from its comfort. My size is normally 46-47 but from reviews I read I decided to buy 1 size bigger so 48. The risk payed off. The boots are very comfy from what I expected from race boots, its flexibility in dorsal axis is amazing and lateral is more stiff and supportive. I can\'t wait to try to ride in hot summer and feel the perforation and vents but so far it was great deal. Sole is more sticky which I am not used but good grip is more safe for sure. Also SIDI is known for narrow feet but I normally wear barefoot and surprisingly Alpinestars SMXs are more squeeze than these SIDI. I love it so far!
The best of the rest
Posted by Elans Katkovskis 1 30.12.2025
Fit: Fits true to size
It\'s not a boot - it\'s a soft sock shielded by exoskeleton. Truly perfect comfort. No zipper = no issues.
It\'s not a boot - it\'s a soft sock shielded by exoskeleton. Truly perfect comfort. No zipper = no issues.
