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Alpinestars SP-X BOA Boot
Alpinestars

Alpinestars SP-X BOA Boot

$399.95
COLOR: Black
SIZE
Availability: Translation missing: en.general.icons.icon_check_circle icon 15 in stock, ready to be shipped
  • SP-X boots are a sleek sport boot designed to fit under tech riding pants and provide superior walking capability
  • Optimized for the sport and sport touring rider, the SP-X are compact, mid-height boots with premium levels of protection and comfort on and off the bike
  • The upper is constructed from a combination of Rideknit material and knitted mesh, plus seamless thermo-welded parts
  • The lower features a TPU heel counter, toe slider, and the Alpinestars Transversal Protection Frame (TPF) on the sole, allowing for high levels of protection against impacts and any bending or twisting
  • Additionally, the sole also features an all-new design with an asymmetric back heel to facilitate the rider’s natural stride and promote off-bike stability
  • For protection, the SP-X has an integrated shin impact protector, dual-density ankle discs, plus TPU shift pad and toe slider reinforcement
  • For comfort, the knitted areas on the front and back flex points offer great freedom of movement, while the PU midsole with integrated double cushioned heel compound and removable OrthoLite insock, provide great walking comfort
  • In and out is facilitated by a medial zip combined with the BOA speed lace system for compact and precise closure
  • SP-X boots are perfect for those sport riders looking for coverage and protection but without the full race boot, over the pant look

The overall fit/size of this new style seems “true” to their published size chart (see below), so if you are comfortable with a certain size from previous boots, then choose the same size. I’d consider the width of the men’s sizes to be normal to slightly wide (D or E).

Euro Men’s US Women’s US
36 3.5 5
37 4 6
38 5 7
39 6 8
40 6.5 8.5
41 7.5 9
42 8 10
43 9 11
44 9.5 11.5
45 10.5 -
46 11.5 -
47 12 -
48 12.5 -
49 13.5 -
50 14.5 -

Our Two Cents

The SP-X Boa Boots from Alpinestars are a very interesting pair of boots. On the one hand they have touring and comfort in mind, but on the other they are a pair of sports boots that feature a Boa system and replaceable sliders.  Who are these boots for? I would say they are perfect for people on sport touring bikes, people who like to go for long distance rides, but still get fairly spirited once the opportunity presents itself. 

Upper construction is a combination of advanced microfiber, ultrasoft rideknit material and knitted mesh. 

On the lower end we have a TPU heel counter, the previously mentioned toe slider, and the alpinestars transversal protection frame is featured on the sole.

Further touching on protection there are dual density ankle disks, an integrated shin impact protector, as well as a TPU shift pad reinforcement. 

Alot going on with comfort and convenience as well,the main closure as I am sure you guess from the name is a boa system, these really are great and make getting boots on and off so much easier, just pull and the boot opens, twist and it closes. 

There are also large knitted areas on the front and back of the boot, this will aid with both comfort and flexibility, there is also a pu midsole with a double cushioned heel and a removable ortholite insock, this will provide great walking comfort. 

Overall I think these boots are definitely worth checking out as they are both comfortable and functional and I do think they fit a very specific purpose very well. Overall they earn a CE 2-2-2-1 rating which I think is an excellent rating for this level of comfort. Keep in mind there is also a Drystar version of these boots if you are looking for something that is waterproof. :: Damir 8/29/25