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The TR90 is one specialand compoundsone of Nylon and carbon fiber used by DEMON for the constructionone of all sports sunglasses frames and Vista Sport. It's a compositionone hypoallergenic and can be used in extreme conditions even for very prolonged use without skin irritation. The peculiarity of the TR90 is the exceptional elasticity and resistance to accidental impacts and mechanical tractions (e.g.one for changing lenses), it is also 20% lighter than frames made with conventional materials. Generally a mount built with this specialand compoundsone It weighs between 20 and 45 grams depending on the thickness of the frame. La performance is the number 1 goal of DEMON, choosing glasses with a TR90 frame is the choice for those who want maximum performanceone, and is constantly looking for technical materials that guarantee comfort, safety and aesthetics. The TR90 has a feature called memory, in fact when you wear the glasses it adapts to your face gently deforming its shape to return to its original state when it is removed. This feature is fundamental, in fact the glasses retain their memory even at low and high temperatures without deformations. TR90 is also a material with a long lifespan, in fact it has been proven that it has greater resistance over time than frames made with other conventional plastic materials.  The rubberized parts of the frames DEMON they are made of soft Megol, an ultra-light hypoallergenic material that makes weight its main feature. The rubberized parts are designed to increase the comfort of the glasses and prevent all those annoying micro slips towards the tip of the nose. Some models with adjustable nosepiece are equipped with an aluminum core that allows the sports glasses to be adapted to any nose and face shape. It also allows all types of adjustmentsone (in height and depth) of the glasses.