NEVER HIDE titanium frame are 100% titanium, a hypo-allergenic, super light, stiff and strong. Unlike other types of metal, they do not contain any nickel which causes allergic reaction. Never Hide titanium frame will not irritate your skin and resist corrosion from facial acids. It is a very good choice for people with allergies. The technologically advanced beta titanium are made with the design to stay in perfect adjustment, they are more durable than other eyeglasses frames, which are super lightweight and comfortable.