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Video Review

SIDI ST Boots Videos

Sidi ST Boots

The SIDI ST Boot features an easy entry system as well as the finest support and protection features.


  • The patented and trademarked Vertebra System™ protects the rider’s Achilles tendon.
  •  Thermoplastic resin ankle protection.
  • Bolt on (no Velcro™!) replaceable, adjustable and aerodynamic nylon scuff pads on the toe.
  • Composite inner sole.
  • Removable arch support.
  • Nylon shin deflector plate.
  • Lorica outer construction.
  • Double stitched in all high stress areas.
  • All bolt on parts are replaceable.
  • An elastic panel adjacent to the entry zipper allows a bind free zip and improved fit.
  • Dual compound sole.
  • DuPont polymer toe shift pad.
  • Perforated Teflon treated nylon lining.
  • Replaceable shock absorbing heel cup.
  • Padded Achilles area.
  • External Ankle Support Braces with Closable air vents
  • Cam-lock buckle system.
Write a Product Review for a chance to win our monthly $100 giveaways.
SIDI ST Boots 4.9 5 43 43
Couldn't have asked for more I've had the boots for a few weeks, and rode in both extremely hot (90+) and cold weather (40) degrees, and during all my rides they've been comfortable. I've always worn wool socks with them to help with the calf area (make them a little more snug), and when it's hot I just open the vents on the side which allow great airflow. The opening of the boots is really large, which I'm is a design feature for those who'll wear them with a race suit. There are adjustable straps you can use to tighten them up, and the closure locks down really tight. I've only worn mine with jeans, and like the look. They come up just a few inches shy of my knees, so they offer protection for your entire lower leg. The soles of these boots are awesome, and I no longer have vibration foot fatigue. The soles are also more than adequate for walking, and even with the ankle protection the boots are flexible. I'm really happy with the purchase, and wish I had made the purchase earlier. Boots are highly recommended. November 20, 2014
Best Boots These boots fit well, very comfortable on long trips (8hrs) October 27, 2014
Cool boots, lots of protection Lots of protection particularly in the ankle and leg. A bit difficult to walk around in but that's not what they're made for. I wear a 9 1/2 and the 44 is a bit cramped in the toe box but with thin socks it works ok. Compact enough to work well if your bike doesn't have a lot of space between foot peg and shift lever. October 26, 2014
Great features Boots are very good quality and very comfortable. True to size for the most part, I wear a 10 - 10 1/2 shoe and a size 44 fits very well with just a slight bit of extra room. They are every light weight and break in easily. Also replaceable toe pucks are a plus September 1, 2014
Get these boots! Very impressed with this boot. I wear them on a StreetGlide and on a KLR 650. I was pleasantly surprised with how well the vents cool off my feet. Close the vents and they keep cold air and rain out long enough for me to get to a bike stop. And they're comfortable enough to walk around Sturgis with a smoked turkey leg in hand. August 10, 2014
Excellent perfect boots, they are amazing perfect fit, little bit narrow, but nothing to be worried July 18, 2014
great boot for those who want good protection I love this boot. After getting that out of the way, let's get down to it. These boots are great boots. The protection is great, they are comfortable for me, (I have larger calves and wear a size 43) they are slightly in the narrow side, but not enough to really make a difference. The only time I notice it is after a long day of walking around, but as soon as I hop on my bike I never even notice it. When riding, which is what these boots are designed for, these boots shine. They offer everything needed for riding. A shifter pad, sliders on almost every available surface, a good sole... They do squeak when walking but who cares? The only thing I would like to see is a way to adjust the fit at the ankle like the vortice has. They can get a little warm on 85°+ days while sitting in traffic, but when you are moving at any kind of speed, your feet stay fairly cool. If you live in a warmer area, or don't plan on doing any riding in the wet, get the ST airs. All in all, it is a perfect boot for those who ride the street hard and want high protection with style and functionality at the same time. June 30, 2014
Tried these in a search for new boots.... I have been looking at these since they first came out - but didn't want to spend the $$$. I finally wore out my A*'s so Had to buy. I tried the TCX R-S2 boots that were on closeout, they did't fit right on me, even though I liked the design. ... But same with these. I wear a 10.5 or 11 in regular shoes - a 45 Euro in motorcycle boots. These ST's (in size 45) were Tight in the toes and the heal of my foot lifted - what felt like 2" with every step. The boots also felt heavy and very bulky. And when sitting on my bike, they felt....slick(?) with all the plastic on the inside, I sent them back and splurged on the TCX RS-2 EVO = Awesome fit and felt lighter than these ST's. Check out my Evo comments.... June 29, 2014
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Use our Product Q&A for a chance to win our monthly $100 giveaways.

Have a functionality, fit, or otherwise product-specific question about the SIDI ST Boots? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

Already Asked: 8 Questions, 35 Answers
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RevZilla Store asked: Why did you choose this?
Steve P: Wanted a pair of full coverage well made and designed boots with good venting that can be shut off. Have trusted Sidi wares in the past. Nov 10, 2014
Lorraine K: My husband really wanted them! Nov 5, 2014
Brendan D: Best Protection Oct 10, 2014
Daniel C: Love these boots, full protection and a great fit. Fantastic for touring and more. Sep 23, 2014
Luis Alfonso A: the best brand on boots Aug 5, 2014
Scott H: Great reviews, sweet looking boot, and excessive safety features. Jun 22, 2014
Susannah T: protection, features May 22, 2014
Gregory C: I chose the SIDI ST boot because of the experience I had with my other SIDI boots. I have been wearing a pair of SIDI "On Road" Gore Tex adventure style boots for about two years now and they've been great. I anticipate the same build quality and performance from the ST model. Mar 18, 2014
Tony B: I've worn Alpinestars for years and these are simply the new standard. Dec 31, 2013
Jerome M: Great boot Oct 30, 2013
P N: Excellent boots! Sep 12, 2013
Andres G: Great protection, security at racing days. Sep 5, 2013
Stephen H: Top quality, high level of protection and comfort. Aug 10, 2013
A shopper asked: which are better boots comfort wise Sidi st or Aplinestars smx plus ? Aug 19, 2013
Answer this · Send to friends Good question? Yes (1) No (1)
Adam W: I can't speak to the Alpinestars, but the Sidi ST boot is very comfortable. I have a pair of Sidi sport touring boots without the external protections and honestly the STs with toe, heel, and ankle hardware external is just a s comfortable on the bike. They are less good for walking around, but fine for social/food/etc stops when out riding. The STs are every bit a day long boot. Aug 19, 2013
Reply to Adam Good answer? Yes (0) No (0)
Andres G: Hi, for me i bought this boots just for race on track and are fantastic, i feel very protected in everything, riding on track feels great, and when i have to walk with this boots there is the issue i feel walking like a robot or when you are at snow with ski boots not confortable for walk not even a block in the street. Aug 20, 2013
Reply to Andres Good answer? Yes (0) No (0)
Chase G: I find that both are comfortable but I wear the Alpine stars far more often, they are not as stiff and feel better for longer rides on and off the bike. Cheers. Aug 20, 2013
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Nathan W: From what I have seen A* typically fits folks with larger calves and wider feet better. Once broken in the ST's are a very nice boot. Aug 29, 2013
Reply to Nathan Good answer? Yes (0) No (0)
Kevin M: The Sidi boots are much more comfortable they are also easy to get on and off and protect the foot and shin very well. Aug 19, 2013
Reply to Kevin Good answer? Yes (0) No (0)
Alvin T: My Sidi ST hurtsmy pinky toe especially if i do any sort of walking in them. Not very comfortable, but manageable. Aug 20, 2013
Reply to Alvin Good answer? Yes (0) No (0)
Edwin Garcia Corado/YO C: if you have thin foot sidi because the boot is tight, if you have wide foot alpinestars Aug 19, 2013
Tony B: I have both and the SIDI ST has more mobility. Jan 11, 2014
Reply to Tony Good answer? Yes (0) No (0)
adam h: Sidi for sure, these boots are simply awsome. Aug 20, 2013
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A shopper asked: How do these boots feel with the vents closed in dry and cold weather (30-50 degrees)? Nov 22, 2014
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Adam W: These boots are either airy, or very airy. Which is to say in cool weather with the vents closed there is still a good breeze coming through, more than you'd experience with any non-vented boot. In cool weather if you want to really have warm toes you'd have to consider a gore-tex or similar sock. Nov 25, 2014
Reply to Adam Good answer? Yes (1) No (0)
Roland H: I have never felt cold in the boots when wearing typical athletic socks. However,the soles on the boots are very thin and lack grip so on wet days be careful when planting your feet on the ground on slippery surfaces. Nov 23, 2014
Reply to Roland Good answer? Yes (1) No (0)
Amman W: Thank you for your help. Can you also mention what were the coldest temps you've ridden in these boots with normal socks, and you were still feeling comfortable? Nov 23, 2014
James S: I can say that in the cooler weather, I use a thicker sock and that the boots feel good. At times, because my bike generates a lot of heat that I leave the vents open unless its wet out. The vents do not pull a large amount of air into the boot, but they do allow for a nice light flow of air in. These boots IMHO, were worth the wait and price. Dec 6, 2014
Reply to James Good answer? Yes (0) No (0)
Ryan W: they work awesome in all temps. Dec 2, 2014
Reply to Ryan Good answer? Yes (0) No (0)
Brian K asked: Just got my hands on a new pair of Sidi ST Boots. Phenomenal product but the left side air vent is rubbing horribly on the side of my foot. Backed out the screws that hold the ankle brace on which helped a bit but am not sure it's a cure. Is this area likely to soften during normal break in? Lot of money to spend on this boot if it doesn't . Also, how do you shorten the strap on the cam buckle? Read something somewhere about popping the strap out in order to make the adjustment but would like some further direction before I risk breaking it. Thanks. RevZilla rocks!!! Feb 19, 2014
Answer this · Send to friends Good question? Yes (0) No (0)
Khalid Q: Unless your left foot is wider than your right, you may have a faulty boot.
Just took a look at mine and the air vent does not come anywhere near my foot, my boots are extremely comfortable, can wear them all day at the track.
I would try on another pair just to be sure.
The strap needs to be popped out of the grey plastic piece that says sidi on it and then you'll see that it moves freely for you to adjust. Just pull it softly outwards from the 2 small tabs holding it in place.
Feb 21, 2014
Reply to Khalid Good answer? Yes (0) No (0)
Jordan T: These boots break in beautifully I've had them 2 seasons now and experienced similar issue at first, before long they were broke in nicely, long rides short rides no discomfort. They are far and away the best protection and comfort combo you can find, hang in there Brian like fine wine they get better with age!! Condition the leather helps them as well, mine look brand new besides minor scuffing on the plastic plating. You made a great choice Feb 21, 2014
Reply to Jordan Good answer? Yes (0) No (0)
Ahmad S: Yes the boot does break in easily and comfortably faster than the issue with the left foot would bother you. You just need a few days on the bike and the boots would feel as comfortable as possible. Actually this boot was my favorite ever.
As for the strap adjustor, you need to pop it upwards from the square metal frame, pull out or in, then push the straps back in place.
Mar 23, 2014
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Victor S asked: How tall are the boots from the heel of the footbed to the top? Dec 1, 2014
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Clifford W: I believe my are size 43 11 about 3/4" from footbed heel to top of back of boot! Dec 4, 2014
Reply to Clifford Good answer? Yes (0) No (0)
Ryan W: about 3/5 up your shin Dec 2, 2014
Reply to Ryan Good answer? Yes (0) No (0)
Victor S: Could I get the measurement in inches? I have really long legs so I doubt they'd cover that much. Dec 2, 2014
William C asked: Are the Sidi Vortice toe sliders compatible with the Sidi ST? Apr 7, 2014
Answer this · Send to friends Good question? Yes (0) No (0)
Gavin A: Hi . Don't know as the Sidi Vortices have holes for ventilation in the boots + toe sliders. Apr 30, 2014
Reply to Gavin Good answer? Yes (0) No (0)
Ahmad S: No, there is a slight difference. I have both and the toe sliders do not match properly. May 25, 2014
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Tesfalem G asked: How do I find the replacement parts? Nov 24, 2013
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adam h: I have not yet had to replace anything. I did however take the rear heal protector off as it rubs the reaset bracket on the brake side and i cant get used to it. Other than that, Amazing boots Nov 25, 2013
Reply to adam Good answer? Yes (0) No (0)
A shopper asked: According to their size charts, SIDI seems to use European sizing and run 1/2 size bigger... If I'm a size 8 USA, will the size 42's fit me or be too big? Aug 29, 2011
Answer this · Send to friends Good question? Yes (0) No (0)
Taliesin1077: I have found when it comes to Sidi sizes, it's best to order a little larger than you might think. For example, on U.S. sizes, I am normally a size 12, and my shoes are a little loose (I like them that way). When I ordered the Sidi Way Rains, I ordered a 46, thinking they would be nice and snug. They were too small. I had to return them (easy) and order a new pair. The 47's are listed as a 12.5, and they fit perfectly.

Based on that experience, I suspect the 42's will fit you just fine. If they don't, Revzilla will allow you to return them and get a different pair. I don't think you'll have to go that route, but it's nice to know you have it available.
Aug 29, 2011
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Mens and Womens Footwear

Footwear Conversion
EURO US MensUS Womens

Sizing information is provided by the manufacturer and does not guarantee a perfect fit.

Click here to see the full SIDI Boots Size Chart
Product Style RevZilla Item # Manufacturer Product # Availability
Black / 7/40 751208 2000000076379 Out of Stock
Black / 7.5/41 751209 2000000076386 In Stock: Ships within 24 hours
Black / 8.5/42 751210 2000000075150 Available: Requires 2-3 weeks processing time prior to shipment.
Black / 9.5/43 751211 2000000076393 In Stock: Ships within 24 hours
Black / 10/44 751212 2000000076409 Available: Requires 2-3 weeks processing time prior to shipment.
Black / 11/45 751213 2000000076416 In Stock: Ships within 24 hours
Black / 11.5/46 751214 2000000076423 In Stock: Ships within 24 hours
Black / 12.5/47 751215 2000000076430 In Stock: Ships within 24 hours
Black / 13/48 751216 2000000076447 In Stock: Ships within 24 hours
Black / 14/49 751217 2000000076454 Out of Stock
Black / 14.5/50 751218 2000000076461 Out of Stock
Black/White / 8.5/42 751231 2000000075143 Available: Requires 2-3 weeks processing time prior to shipment.
Black/White / 9.5/43 751232 2000000076133 In Stock: Ships within 24 hours
Black/White / 10/44 751233 2000000076140 Available: Requires 2-3 weeks processing time prior to shipment.
Black/White / 11/45 751234 2000000076157 Available: Requires 2-3 weeks processing time prior to shipment.
Black/White / 11.5/46 751235 2000000076164 In Stock: Ships within 24 hours
Black/White / 12.5/47 751236 2000000076171 Available: Requires 2-3 weeks processing time prior to shipment.
Black/Red / 8.5/42 751225 2000000075167 In Stock: Ships within 24 hours
Black/Red / 9.5/43 751226 2000000076522 Out of Stock
Black/Red / 10/44 751227 2000000076539 Out of Stock
Black/Red / 11/45 751228 2000000076546 In Stock: Ships within 24 hours
Black/Red / 11.5/46 751229 2000000076553 Out of Stock
Black/Red / 12.5/47 751230 2000000076560 Out of Stock
Black/Florescent Yellow / 8.5/42 882607 SIS-STS-BKFY-42 Out of Stock
Black/Florescent Yellow / 9.5/43 882608 SIS-STS-BKFY-43 Out of Stock
Black/Florescent Yellow / 10/44 882609 SIS-STS-BKFY-44 Available: Requires 2-3 weeks processing time prior to shipment.
Black/Florescent Yellow / 11/45 882610 SIS-STS-BKFY-45 Available: Requires 2-3 weeks processing time prior to shipment.
Black/Florescent Yellow / 11.5/46 882611 SIS-STS-BKFY-46 Available: Requires 2-3 weeks processing time prior to shipment.
Black/Florescent Yellow / 12.5/47 882612 SIS-STS-BKFY-47 Available: Requires 2-3 weeks processing time prior to shipment.