Arena Alupro Aluminium Stirrup - BlackThe Acavallo Arena Alupro stirrups are characterized by the new, patented, laterally opening stirrups based on several years of extensive research and development. High tech combination of metal and polymer materials, produced by means of an innovative, patented injection moulding technique. Due to its design and construction which is based on flexible polymers, the stirrup conveys a less rigid and much more comfortable feeling to the rider than with