The Acavallo Arena Alupro stirrups are characterized by the patented lateral opening, developed after years of research and development. Their technical composition derives from the combination of high-tech metal and polymers produced with an innovative and patented injection molding technique. Thanks to its design and construction based on flexible polymers, the stirrup transmits to the rider a sensation of less rigidity and greater comfort compared to conventional products. The upper part of the bench is made of stainless steel and is characterized by long horizontal holes that prevent the accumulation of sand and dirt, so as to guarantee optimal grip in all conditions; the stainless steel also protects it from corrosion and therefore guarantees a long life of the product. The opening of the stress-activated locking and releasing mechanism is located one centimeter higher than the rust-proof steel part, so as to prevent the foot from slipping sideways by mistake and to prevent sand and dirt from delaying the release. The opening action of the polyamide arm in case of emergency.