Log In / Register
0 Checkout
SIDI Fusion Boots
  • SIDI Fusion Boots
  • SIDI Fusion Boots
  • SIDI Fusion Boots
  • SIDI Fusion Boots
  • SIDI Fusion Boots
  • SIDI Fusion Boots
  • SIDI Fusion Boots

Please select a Size to check availability, or to add this item to your Shopping Cart or Wish List.


Select Size:

Size Chart

Select qty:

Please select a Size to view availability.
Add to Wish List

Video Review

SIDI Fusion Boots Videos

Sidi Fusion Boots

The Sidi Fusion Boots feature an impressive amount of crash protection in a Sport Touring-friendly package. 


  • Vertebra system Achilles and rear calf protection panel
  • Replaceable nylon toe scuff pad
  • Replaceable outer ankle protective cap
  • Nylon shin deflector plate
  • Fully encapsulated heel cup
  • DuPont polymer toe shift pad
  • An elastic panel adjacent to the entry zipper allows a bind free zip and improved fit
  • Double stitched in all high stress areas
  • Zipper and VELCRO® brand closures closure system
  • Lorica outer construction
  • Perforated Teflon treated nylon lining

Sidi Footwear Sizing

Footwear Conversion
EURO  US Mens US Womens
36 3-3.5 4.5-5
37 4-4.5 5.5-6
38 5-5.5 6.5-7
39 5.5-6 7-7.5
40 6.5-7 8-8.5
41 7-7.5 8.5-9
42 8-8.5 9.5-10
43 9-9.5 10.5-11
44 9.5-10 11-11.5
45 10.5-11 12-12.5
46 11-11.5 12.5-13
47 12-12.5
48 13-13.5
49 14
50 15

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

How To Measure

FT Feet What size shoe do you wear?
Product Style RevZilla Item # Manufacturer Product # Availability
Black / 37 599880 2000000055992 In Stock: Requires 2-3 business days lead time prior to shipment
Black / 38 599881 2000000056005 In Stock: Ships within 24 hours
Black / 39 599882 2000000056012 In Stock: Requires 2-3 business days lead time prior to shipment
Black / 40 599883 2000000056029 In Stock: Requires 2-3 business days lead time prior to shipment
Black / 41 599884 2000000056036 Only 3 Left: Ships within 24 hours
Black / 42 599885 2000000055879 In Stock: Ships within 24 hours
Black / 43 599886 2000000056043 In Stock: Ships within 24 hours
Black / 44 599887 2000000056050 Only 1 Left: Ships within 24 hours
Black / 45 599888 2000000056067 In Stock: Ships within 24 hours
Black / 46 599889 2000000056074 In Stock: Ships within 24 hours
Black / 47 599890 2000000056081 In Stock: Requires 2-3 business days lead time prior to shipment
Black / 48 599891 2000000056098 Out of Stock: Expected to ship early-August
Black / 49 599892 2000000056135 Out of Stock
Black / 50 599893 2000000056142 Out of Stock


Orders $39.99 and over qualify for our fast free shipping offer. Click Here for FREE Shipping Terms and Conditions.

Please see our International Orders page for orders shipping outside the US.

We show real-time availability on this product page when you select the size/color item you want.  Most items will ship the same business day an order is placed,however if an item requires additional processing time a message will be shown indicating such.

See our full Shipping Policy for further details.


If your order arrives and it is not right, we will we'll fix it, NO NONSENSE, we promise.

Doesn't fit or just not happy with it? You can return any new, unused and unaltered item within 30 business days of delivery receipt of your item. We will issue a full refund to your original payment method.

See our full Return Policy for all of the pertinent details.

Write a Product Review for a chance to win our monthly $100 giveaways.
SIDI Fusion Boots 4.5 5 53 53
Amazing boots for the money, but a bit narrow These boots are absolutely fantastic overall, particularly given the price. I have another pair of Joe Rocket boots that weren't dramatically cheaper, and the difference is like night and day. These boots have a stiff sole and offer great ankle protection, and I like that they have a heel. I've used them in temps down in the 40s and up into the 80s and my feet have always been comfortable. That said, they are not waterproof in any way. They'll withstand light rain, but water from wet roads and heavy rains will get through pretty quickly, particularly in the reinforced shifter area on the right toes. My biggest problem with these, and it's not a problem with the boots per se, is that they're a bit narrow. I usually wear a size 9.5 in regular shoes (and 45s in most cycling shoes), but ordered a 44 based on the size chart. I'd say they fit well enough length-wise, to the point where I think a 45 would've been too big, but my right foot (which is slightly bigger than my left foot), is really squeezed in the toe area due to the narrow footbed. It's fine when I'm riding, but a bit uncomfortable when walking around. I'd say the boots may have stretched a tiny amount after almost 2k miles in them, but the right foot squeeze is only marginally improved from when I got them, so don't expect they'll loosen up over time. May 17, 2016
Put off for years, kicking myself now (in my fancy new boots) I was riding on a pair of Vega piece-of-junk boots for 3 years. I kept looking at new, proper racing boots, but just couldn't legitimize the price. I'm really displeased I waited. For me, this was my first experience with a full boot, so yes - you do notice a change in shifting in comparison to a half boot. You can't bend your ankle as much right out the gate, but I acclimatized quickly. The biggest thing I noticed right away was the rigidity of the bottom of this boot and how incredible it felt to not have my pegs digging in to the bottom of my foot - the bottom of this spreads the pressure throughout the foot and feels GLORIOUS. It's a comfortable boot, and breathed really well. I was surprised. I'm a little nervous about how well the zipper will hold up over time, but I'm super pleased. The sale price for this absolutely sold me over the Alpinestar S-MX5 I was going to buy. Would absolutely buy again.... 2 years sooner so I could enjoy them more. May 17, 2016
Great Boot for the Money These are great boots. I've been using Sidi products for many years and these boots live up the the name. The quality looks to be excellent. I've just had them for a week so durability remains to be seen, but I see no reason why they would not be long lasting. They are not very comfortable at first. But that improves as you ride. Give them time for a proper break-in. Fit is good, I normally wear an American size 10 and size 44 fits. April 19, 2016
Strange fit... stylish, stiff.... Great looking, sturdy boot. Moderately priced. Good value. The fit, in my opinion, is actually on the large side. I bought a 44 and I am a US size 10.5. However, my heel has so much room and sits so far from the back of the boot, it almost feels as though my foot will slip out. Its not "uncomfortable" per se, but the weird thing is that it feels like my toes are pressed up quite far towards the tip of the boot. Very weird fit. I will also say that the stiffness of this boot has made upshifting VERY tricky. Sometimes I have been actually unable to get into the next gear without looking down and adjusting my foot position to get more leverage. Not ideal. Hopefully they break in some more and it gets easier. August 15, 2015
Awesome first boots! These were my first "track" boots so they felt rather different at first. After riding with them for a day, I was able to feel comfortable while riding. They are a bit large around the calf but then again my calves are small. These boots feel great, look great: defietly recommend them. April 13, 2015
Exactly what I was hoping for This was my first boot purchase. I'd tried wearing some timberland work boots before but the toe box had made it very difficult trying to shift and feel where my feet were, so I have just been riding in some custom extra high top converse. I was a little worried at first that I would have the same feedback and shifting problems with these, but there was no such issue. Took about 2 seconds to get used to them. Anyway- I usually wear about a 9 and have (I assume) average width feet, and the size 42 fit just right. I just unboxed my literally 2 hours ago, so they're still very stiff. I think they could do with a little padding on the inside to protect your foot from the hard parts but otherwise these seem very comfy. April 11, 2015
Nice boot I like the fit of these boots. I got a size bigger than I usually wear and they fit. They seem to run small. They are comfortable the top of the boot, is a little wide. March 16, 2015
Great Boot Bought this as my first set of boots. As a college student, I wanted something with a strong brand reputation, but also with a good price. I think I found it here. Boots feel very rigid and protective, but flex in the right places after a bit of break-in. Zipper and velcro is all well placed, and works perfectly. I can fit a set of jeans over them perfectly for running to the gas station, or put them on with my riding pants for long rides. From what I researched, they also seemed to hold up well with crashes from several other people, and that's the first comment that I look for before making a purchase. Only thing that I don't like about them is that they can be a little uncomfortable on your shin if your socks aren't long enough and you're walking longer distances, but that's more of a personal decision issue. February 7, 2015
2 3 4 5 ... 7 next>>
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 Fusion Boots? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.