Alpinestars Flex AST-8 Denim pants are designed to combine advanced protection, everyday comfort, and timeless denim style. Crafted from single-layer A-TRAACX technical denim—incorporating COOLMAX® technology, CORDURA®, cotton, and Nylon 6.6—these pants offer excellent abrasion resistance and long-lasting performance.

The integrated COOLMAX® technology wicks moisture away from the body, keeping riders cool and dry and enhancing comfort during extended rides. Meanwhile, the abrasion-resistant, single-layer construction provides durable protection without compromising the authentic look and feel of classic, everyday denim.

Engineered for superior riding comfort, the Flex AST-8 Denim pants feature a classic regular-straight fit and include Alpinestars Nucleon Morph Level 2 STEALTH knee and hip protectors. These ultra-thin, adaptable protectors offer extensive coverage and effective impact protection without sacrificing comfort or freedom of movement—making them ideal for riders seeking a refined, AA-rated technical motorcycle denim with a classic, casual aesthetic.
AA-rated motorcycle denim: The single-layer A-TRAACX technical denim blends CORDURA®, COOLMAX®, cotton, and Nylon 6.6 yarns to deliver exceptional abrasion resistance, outstanding durability, and long-lasting, everyday riding comfort.
Stay cool and dry — COOLMAX® technology: Integrated COOLMAX® yarn wicks moisture away from the body, keeping riders cool, dry, and comfortable in warm or variable riding conditions. Long-lasting comfort: The robust, multi-stretch denim construction offers enhanced mobility, enduring comfort, and unrestricted freedom of movement—whether in the saddle or on foot.
Ergonomic Nucleon Morph STEALTH protection: The ultra-slim, Level 2 Nucleon Morph STEALTH protectors are anatomically contoured for a natural riding position, adapting to the rider’s body to provide optimal coverage, effective impact protection, and superior riding comfort.

Advanced technical denim construction: The single-layer A-TRAACX technical denim blends CORDURA®, cotton, and nylon 6.6, delivering an ideal balance of abrasion resistance and long-term performance.
Integrated COOLMAX® technology: Built-in COOLMAX® technology wicks moisture away from the body, keeping riders cool and dry for greater comfort during long rides.
Reinforced seam construction: Featuring hidden double stitching and overlock seams on the outer legs, combined with internal double stitching and contrasting red overlock seams, the design ensures enhanced structural integrity and durability.
Everyday practicality: A classic five-pocket design provides convenient storage for daily use.
Reliable closure: A metal zippered fly ensures a smooth, durable, and secure fastening.
Refined denim finish: A selvedge-style finish helps prevent fraying while providing a clean, high-quality look.
Premium details: A leather back patch, branded belt loops and rivets, and an embroidered "Astar" logo on the back pocket add distinctive, high-end touches. Classic motorcycle fit: A straight, regular fit provides a timeless silhouette, ensuring comfort and freedom of movement both on and off the bike.
Wide range of sizes: Available in short and long versions to accommodate a broader range of riders.

Advanced knee protection: Low-profile, 10mm, Level 2 Nucleon Morph STEALTH knee protectors offer extended coverage, effective impact protection, efficient airflow, and lightweight comfort. Ultra-thin and adaptable, they conform to the rider’s knees for all-day comfort.
Advanced hip protection: Level 2 Nucleon Morph STEALTH hip protectors provide ultra-thin, adaptive impact protection while maintaining everyday comfort and a discreet profile.
Customizable knee protection: Knee protector pockets are adjustable to three positions—spaced 3 cm apart and marked with colored stitching—allowing riders to fine-tune the height of the protectors for optimal coverage and a personalized fit.
CE-certified – Category II, EN 17092-4:2020, Class AA.