Sweat-proof Elastic Lace Melt is adjustable and can fit any head size. The velcro can be tighten to adjust the elastic band to help melt the lace into skin and get a flawless install. It promotes longevity of your lace and can last up to 2 extra weeks . This belt is good for frontals, closures , wigs and baby hair. This belt is known for helping beginners when it comes to installations as well and can be used for styling every day, day,sleep and for sweaty workouts you wont have to worry about your lace slipping!