The boll iri s safety iri s safety eyeshield with bifocal reading area is a model designed to be universal and ultra modular and infinitely adaptable to every individual thanks to its unique b flex shape memory bridge the b flex bridge is height and width adjustable and the iri s also has pivoting non slip ergonomic temples optical class 1 polycarbonate lenses anti scratch and anti fog lenses available in a variety of reading powers they are supplied with a sports cord en standards en 166170172