Alpinestars Riffs Armored Denim Pants: Construction The Alpinestars Riffs Armored Denim Pants are constructed from 13oz denim. The seat, hip and knee areas are reinforced with aramid fiber for additional protection. Accordion stretch panels on the knees and seat provide flexibility and comfort. Zippered air intakes on the thighs allow air ventilation. These pants incorporate CE-certified knee protection in […]