Alpinestars Flex-Ast 5

The Alpinestars Flex-Ast 5 motorjeans redefine what everyday riding denim should feel like. You get the clean look of casual jeans, combined with integrated motorcycle protection and CE-certified performance. The foundation is a lightweight monolayer stretch denim construction. Instead of bulky reinforcements or heavy linings, this single-layer fabric blends cotton with polyester and polyamide to deliver durability, flexibility and reduced weight. The built-in mechanical stretch allows natural freedom of movement on and off the bike, while maintaining structural integrity in key impact zones. Hidden double stitching and overlock seams further strengthen high-stress areas for long-term reliability.

Protection is discreet yet effective. You benefit from slim-profile Nucleon Flex Plus Level 1 knee protectors, engineered with 3D shaping and airflow channels for enhanced breathability and all-day comfort. The three-position adjustable knee protector pockets allow you to fine-tune armour placement for optimal impact coverage and a tailored fit. The jeans are also hip-protection ready, compatible with optional Bioflex Level 1 protectors (optional). Certified as a CE Class A garment, they exceed abrasion and tear strength requirements by 20%, ensuring serious protection in a casual silhouette.

Comfort and ergonomics are carefully refined. A raised rear waist improves coverage in the riding position, while the regular tapered fit creates a modern profile that transitions effortlessly from road to street.