Frames of sunglass

Frames square measure usually made from plastic, nylon, a metal or a metal alloy. Nylon frames square measure typically employed in sports as a result of they're light-weight and versatile. they're able to bend slightly and come to their original form rather than breaking once pressure is applied to them. This flex may also facilitate the glasses grip higher on the wearer's face. Metal frames square measure typically a lot of rigid than nylon frames, so they will be a lot of simply broken once the user participates in sport activities, however this can be to not say that they can not be used for such activities. as a result of metal frames square measure a lot of rigid, some models have spring loaded hinges to assist them grip the wearer's face higher. the tip of the resting hook and therefore the bridge over the nose may be rough or have rubber or plastic material to boost hold. The ends of the resting hook square measure typically arcuate so they wrap round the ear; but, some models have straight resting hooks.