Flex-AST 5 Denim Pants

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The FLEX-AST 5 Denim Pants are protective riding jeans reimagined for everyday wear. Designed with a lightweight monolayer stretch denim construction and a clean, tapered fit, they deliver all-day comfort and casual styling without compromising on safety. Engineered to exceed performance specifications and CE certification standards, these jeans offer discreet, built-in protection with refined detailing and a modern wash and finish—making them an ideal choice for riders who want all-day comfort and everyday practicality with built-in moto-specific protection.

Premium Comfort: Lightweight monolayer denim with built-in mechanical stretch offers riders premium comfort and everyday wearability.
Tailored Fit: Regular tapered fit for a modern silhouette that transitions effortlessly from road to street.
Casual Styling, Moto Protection: Clean, lifestyle denim aesthetic with built-in protection—the perfect everyday riding jeans.
Adjustable Armor Placement: Three-position adjustable knee protector pockets allow for a personalized fit and optimal impact coverage.
Protective Armor Inside: Equipped with Nucleon Flex Plus knee armor for enhanced comfort, breathability, and premium protection.

Engineered for Performance: Designed to meet Alpinestars’ FLEX-AST comfort specifications, the high-performance monolayer construction delivers lightweight durability and long-lasting comfort.
Comfortable Stretch Blend: Durable, lightweight fabric composition of 53% cotton, 30%+ polyester, and 17% polyamide offers a lightweight feel with built-in stretch for all-day comfort across varying climates.
Durable Construction: Hidden external double stitching and overlock seams ensure long-term structural integrity and lasting performance in impact-prone areas.
Ventilated Armor Pockets: Lightweight and breathable protector pockets are designed to maintain airflow , while securing the armor for effective impact protection and enhanced comfort.
Ergonomic Waistline: A raised back waist provides enhanced coverage and comfort in the riding position.
Functional Storage: Deep, easy-access hand pockets are designed for practicality—even while seated on the bike—keeping essentials secure and within reach.
Classic Denim Aesthetic: Heritage-inspired details include selvedge-look interior seam stitching with color contrast thread and subtle Alpinestars logo embroidery on the coin pocket, delivering an authentic denim finish.

Nucleon Flex Plus Knee Armor: Level 1 slim-profile protectors with 3D shaping and breathability for all-day comfort and protection.
Knee Protector Positioning Pocket: the pants feature 3-position, adjustable knee armor pocket, for convenient positioning of the protectors for a optimal coverage and a perfectly tailored fit.
Hip Protection Ready: Compatible with optional Bioflex Level 1 hip protectors—flexible, adaptive, and low-profile for discreet safety.
Certified A Garment: Meets the safety standards as a CE certified Class A Garment, ensuring optimal protection and performance.
Certified Safety Performance: Exceeds CE abrasion and tear strength thresholds by 20% in final wash and finish.

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Comfort Construction

Monolayer lightweight construction with built in mechanical stretch.

Convenient Storage

Deep hand pockets for riding comfort when loaded.

Casual Fit

High back waistline for riding comfort and protection with a regular tapered fit.

Customizable Protection

CE Level 1 Nucleon Flex Plus knee armor delivers ventilated, low-profile protection with adjustable internal pockets for a custom fit with Bioflex Level 1 armor at hip.