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Wearing a pair of glasses has always been quiet baffling for sports lovers. When they play sports, the glasses may easily fall off onto the ground or even break into pieces. The design perfectly settles the problem-----the string drawn out from the end of the glasses can be connected to the other end so as to fasten the glasses stably and prevent them from falling off when the user is playing strenuous sports. The glasses are versatile that it can randomly switch from a pair of leisure glasses to a pair of sports glasses.