The Alpinestars SMX-S motorcycle boots are designed for riders who want dependable protection, comfort, and precise fit in a performance-focused riding boot. This black and white model is sized for US 4 / EU 37 and features a durable, high-tech microfiber upper that provides flexibility while helping resist abrasion. The ergonomic last supports an accurate fit, while the large throat profile instep and Achilles flex bellows promote comfortable movement while riding or walking.
Protection is built into the boot through double-injected polyurethane shields covering the shin, ankle, calf, toe, and heel. An additional inner protection panel is connected to the heel counter and positioned beneath the outer shell along the outer ankle for added coverage. The interchangeable bi-injected polyurethane toe slider uses a snap-in assembly for convenient replacement. Alpinestars’ exclusive rubber compound sole incorporates structured shank reinforcement to support the arch area and enhance riding performance.
For all-day comfort, the SMX-S includes a quick-drying polyamide lining laminated with open-cell foam and contoured high-density padding to help absorb shocks around the foot. A breathable MTP mesh liner, anatomical removable polyurethane foam footbed, and strategically placed air vents at the ankle, heel, and forefoot help maintain airflow. The inner-side entry system uses an elastic-mounted zipper and extra-wide hook-and-loop flap for easy access and a secure, comfortable closure. The Alpinestars SMX-S is suited for motorcycle riders seeking a protective sport boot with flexible construction, supportive fit, and practical ventilation.
Manufacturer: Alpinestars
Vendor Part Number: 2223517-12-37
Fitment: Designed for riders requiring a US 4 / EU 37 motorcycle boot size.
Features:
- Size: US 4 / EU 37
- Model: SMX-S
- Brand: Alpinestars
- Manufacturer Part Number: 2223517-12-37
- Vendor Part Number: 2223517-12-37
- Color: Black/White
- Upper: Flexible, abrasion-resistant high-tech microfiber construction
- Protection: Double-injected polyurethane shields cover the shin, ankle, calf, toe, and heel
- Toe Slider: Interchangeable bi-injected polyurethane slider with snap-in assembly
- Lining: Quick-drying polyamide lining with open-cell foam and contoured high-density padding
- Sole: Alpinestars exclusive rubber compound with structured shank reinforcement
- Ventilation: Air vents at the ankle, heel, and forefoot with protective mesh coverings
- Closure: Inner-side elastic-mounted zipper with extra-wide hook-and-loop flap
- Footbed: Anatomical, removable polyurethane foam footbed
- Fit: Ergonomic last designed for a precise, comfortable fit