The Alpinestars Nucleon Flex Pro Knee Protector is engineered to deliver high-level impact protection with the flexibility and comfort riders need for everyday riding. Built with innovative Nucleon Flex Pro technology, this knee protector features a lightweight, ventilated construction that promotes airflow while maintaining a slim, low-profile fit inside compatible riding gear. 

Its ergonomic design allows for natural movement and broad coverage, while the adaptive structure molds to the rider’s body for improved comfort and a secure feel. The open design enhances ventilation to help manage heat, and the discreet profile keeps the protection unobtrusive when off the bike. Certified to EN 1621-1:2012 Level 2, the Nucleon Flex Pro Knee Protector delivers advanced protection in a flexible, rider-focused design.