Alpinestars S-MX 4 Motorcycle Race Boots ::

Alpinestars S-MX 4 Boots

  • Boot is a hybrid of high performance race technology and everyday street riding functionality
  • Wide-fitting foot shape design for maximum comfort
  • Durable microfiber and injected PU construction guard shields the shin, ankle, calf, toe and heel from impacts
  • Innovative air vents at the shin, calf, heel and forefoot are covered with specially designed mesh that has a waterproof membrane that lets the foot breathe in warm weather while keeping moisture out
  • Large instep and Achilles flex zones for superior comfort
  • Quick-drying polyamide lining is laminated with open-cell foam and high-density contoured padding to absorb shocks to the foot area
  • Extra-wide hook-and-loop flap, combined with offset rear opening system that features an elastic-mounted zipper, results in a precise, comfortable fit
  • Anatomical, removable PU foam footbed is vented to keep the rider’s foot cool and comfortable
  • Interchangeable bi-injected PU toe sliders snap into place
  • Dual rubber compound race sole provides a precise feel and improved grip on the foot pegs
  • Exclusive sole design features a structured shank reinforcement for added support to the arch area

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Sizing Information

I find the length of these boots to follow the chart well. The width is wider than most… I’d say D or E comfortably, or even EE. The toe is very round as well, so that would work well for those with wider feet. Folks who have narrow feet should stay away from this one. Go with a boot that runs more narrow (by comparison) such as Sidi.

Euro Men’s US Women’s US
36 - 5
37 - 6
38 - 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 -

Our Two Cents

The S-MX 4 boot is moderate in style, function and price. It’s aimed at the sport/street rider who may also occasionally do amateur track events (or not). The styling of the boot is fairly sedate (especially in the black color), so these boots fit in fine for street use, even for use under jeans. But the overall style would be compatible for use with leathers tucked in as well. And as mentioned above, the fit is more relaxed than most and the foot bed is wider. The boots have some pretty substantial armor in the right places, such as calf, ankle area, heel cup, toe box…even the back of the calf. The materials used in making the boot are thick and substantial. For comfort the boots have several intake vents on the boot to move some air through. Take the “View Larger Pictures” link above for some good close-up pictures of the boot and its features.

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