Are the Alpinestars SP-X Boa Drystar boots actually waterproof?

Yes. They use Alpinestars' Drystar membrane, which is designed to block rain while letting some moisture escape. They suit wet commutes and touring, though standing in deep water is not what they are built for.

How does the Boa closure work on these boots?

A dial on the upper tightens steel laces evenly across the foot; pull the dial out to release. It is faster than laces and gives more consistent tension than straps, but a damaged wire needs a Boa replacement kit.

Are they good for hot weather?

The knitted mesh panels and 3D mesh lining help airflow, and the breathability rating is 5000g/m². They are warmer than vented summer boots but more breathable than full leather touring boots.

How do they compare with the Alpinestars SMX-6?

The SMX-6 is a sportier boot with a more rigid chassis and replaceable sliders. The SP-X Boa Drystar is softer, waterproof and easier to put on, which suits commuting better than track use.

What protection do they offer?

Dual-density ankle protectors, a TPU heel counter and an internal shin reinforcement, all under EN 13634:2017 certification. That is solid road protection, short of a dedicated race boot.

What sizes are available?

EU 38 to 48. Try them with the socks you ride in, since the Boa dial and microfiber upper fit differently from laced boots.

Where is the Alpinestars SP-X Boa Drystar Motorcycle Boots cheapest?

At Mega Motorcycle Store, for $308.71, 26% under what the other stores charge, as of our latest check.

Where can I buy the Alpinestars SP-X Boa Drystar Motorcycle Boots?

28 stores we checked sell it, including Cascade Tire & Racing Services, Powersport Superstore, Reno Motorsports, Lutzka's Garage, Mega Motorcycle Store.