The Sidi Rex Instep Tensioner is an essential replacement part for Rex and Rex Air boots. It offers a secure, adjustable closure system using advanced tensioning technology to ensure a comfortable and snug fit. The Tecno-3 system allows for quick adjustments, giving riders precise control over boot tension. Perfect for replacing worn-out components, this tensioner helps maintain the top performance of your boots on and off the track. Sidi Rex Instep Tensioner