Sidi Rex Air Boots

My lady has very large calves but small feet making it fairly difficult to find boots that would close with her suit pants inside. These were great with their style of closure and no zipper it made them very easy to get on and closed. They were also the only boot out of the 6 different pair we tried that would work with her suit pant legs. Highly recommend for larger calves! They also held up very well in a crash!

They were delivered yesterday and I tried them on right away. Comfortable and flexible (great range of motion) and very well-built. I'm impressed with the quality of its components. Took them on a ride this morning and I'm just blown away by how good these boots are. I'm looking forward to many long track days with these boots keeping my feet safe & comfortable. I wear size 10.5 shoes and I have wide feet. I bought these in Euro 44 and they are perfect. I still have some toe room.

The most comfortable boot I have worn yet. Unfortunately I've already had a crash with them. Did an outstanding job of protecting my feet and ankles.

these boots look great. the toe vent really does work, lots of air when riding. they are quite comfortable. however they are requiring some break in. the biggest thing is getting them on and off. they are yielding with multiple on and off, loosening up. the big thing for me is the protection these boots look like they were made to give, and look good doing so. i have a pair of alpinestar super tech and prefer these boots.

I purchased these boots for summer riding, in the Southeast. I will break this review into three parts. 1. Fit, 2. Function, and 3. Overall Thoughts. 1. Fit First, about my foot. ankle, and calf. I wear a size 12 in nike/asics/brooks, or whatever other standard running shoe brand. My foot is narrow and not very thick from top to bottom. My ankle bone area in also thin. My calves are thinner than most, as well. Typically it is difficult to find snug fitting motorcycle boots because of my foot and leg's thinness. I ordered these in a size 45 ( I also wear a 45 in Sidi Crossfire 3 SRS, for any dirt guys comparing). If these boots were any shorter, I would have to size up. I would typically never be ok with a shoe having so little extra room, but once on the bike, I have no issue with rubbing my toes on the end. (Like any piece of gear, try it on, on the bike) For comparison, I have a pair of Dainese Torque D1 out air boots. I wear a size 44 and they have slightly more room, length wise, as do my size 45 Crossfire SRS . The Dainese fit a little more snug around my ankle. That is the only area in which the Dainese is better. The adjustments on these boots are phenomenal. Having small calves, boots often lack adjustability here. With my leathers on they snug up nicely, but still offer tons of room for larger calves. As mentioned, the ankle is pretty roomy, and the foot bed is wider than expected from Sidi. One could add a slightly thicker sock, and it is not longer an issue. 2. Function Before I dive into its actually uses, let me just say these boots are badass. They are beautiful, and look ready to perform. The airflow in the boot is amazing. As I mentioned previously, I have a pair of Dainese torque d1 out air boots. They do not flow half the air that these do. I have about 400 miles of mountain road riding on these, so far. Returning home on 90 degree days, while wearing leathers, my socks are completely dry. The coolest I have ridden with them would be in overcast, damp low/mid 60's and my feet never felt cold, even though I had all of the vents open. These are roughly 1/2 inch taller than my Dainese boots. They feel much more stable and secure than the Dainese's, as well. These feel more like a high level dirt boot, in terms of support. However, these are insanely comfortable and flexible right out of the box. I wore them around the house, twice, for about 30 minutes just to check everything out. I never felt there was a break in period. The soles are grippy and confidence inspiring, but still stiff. Peg and shifter/brake feel is great. I would not want to run a marathon in these, but they are comfortable off the bike to walk around for a bit. I noticed significantly less side to side flex in these vs the Dainese, which was my chief complaint with them. I want to know my ankle is secure, while riding. Putting these on, and removing them is super easy. When tightening, going from the top, down, seems to work best for me. 3. Overall Thoughts As with all Sidi products, the Rex Air is a top notch boot. It does everything it is advertised to do and looks great doing it. Yes, they are expensive. If you are lucky enough to see them on sale, buy them immediately. If you are on a naked/sportbike, doing spirited street riding or track days, these are the ticket.

These boots are great! Two cents on each boot to keep those toes nice and cool. They were a little tight to get on the first time, but no problem after that. The three different adjustment points are nice for getting a firm but custom fit. These boots are solid compared to anything else I have ever worn on the track. SIDI makes a top of the line boot. Get these! You won't be disappointed!

Impressive support while maintaining flexibility. The perforations and vents provide noticeable cooling. Coming from years of Alpinestars Super Tech R boots, I feel they are bit more snug fitting and rigid feeling so some break in or adjustment time is needed. I was concerned about fit over my suit due to large calves but they fit fine. I wear a size 47 in Alpinestars and these fit just as well in the same size. I had a couple Vertigo boots years ago and switched to the Super Techs when the Vortice came out because when upgrading I didn’t like the idea of the looped plastic tightening strings. I decided to give these a try since they’re coated steel now and they work well so far. Satisfied for now with the quality and hope they continue to perform well.

Info: I picked up a pair during the spring 2019 sale. It was to good a deal to pass on a new model of boot. My foot size is between an 11 3/4 and 12 US sizing. Feet are normal, not wide or narrow. I ordered the 12 1/2 boot the largest available. Pros: The boots are pretty solid in construction. Nothing feels cheap like it will break after repeated use. Plenty of flexibility and provide excellent feel on the pegs. The toe air vents are damn good at letting air in. At speed it feels like you have a mini fan inside the front of the boot. The side vents are noticeable as well. Cons: As I mentioned I do not have wide feet. However the boots were a PITA to get on the first couple of times. While the outer portion of the boot opens up the inner channel is pretty narrow. Trying to slide my foot down the channel was an ordeal to say the least. With break in it became easier but it still requires some effort. The side vent angles in too much which greatly reduces the boots width at that one specific location . Normal break in didn't help much. I restored to sticking my hand into the boot making a fist and applying outward pressure at the vent location. Also left some large objects over night to help push the area out a little. After doing the above the area was no longer an issue. Also leaving a little slack in the toe strap by not tightening it all the way taught can help. Hopefully in a future version they won't angle the venting area inwards so much.