The kask vertigo 20 road bike helmet delivers the perfect blend of comfort ventilation and protection it features kask39s proprietary up39n39down double pivot system to provide a perfect fit the straps work to cradle the back of your head which you then tighten to secure the helmet the helmet also has a highly breathable non slip gel internal liner which combines with the fit system for the perfect fit you can then use the eco leather chinstrap which is padded to secure the