Flex-On Green Composite Stirrups - Black *Pre-order*Flex On Green Composite Riding Stirrups in Black. Designed from an organically sourced polyamide material, the Green Composite stirrup is designed on the same model as the Aluminium Flex on stirrup. It can be cleaned with water and is therefore easier to maintain. It is aimed at a wider range of riders. Still providing dramatically improved technical performance in terms of shock absorption and ergonomics (a specific feature of Flex on), it has an