The tifosi radius fototec sunglasses have been made with a flexible frame made from a durable grilamid tr90 nylon material which features hydrophillic rubber on the nose pad and armsear pads which offers a none slip fit as the more you sweat the more grippy the rubber becomes ensuring the glasses don39t budge causing no extra distractions as you pedal hard the nose and ear pads on these tifosi cycling glasses are easily adjustable in order to give you a more customised fit for better comfor