Miraflex Replacement Medium Adjustable Elastic Head Strap Original Miraflex replacement head straps to perfectly match your childs excisting Miraflex frames. Let's face it. Kids play hard, and Miraflex frames are up for the challenge. The plastic polymer used in Miraflex frames looks great years after its purchase. Unfortunately the head strap can get a bit dirty over time. As your child goes about His/Her day small amounts of dirt and sweat gets trapped inside the elastic band leading to something rather unsightly. With the matching strap your childs frames can look brand new again. Simply remove the old strap and clip in its replacement. All matching straps colors are available. Simply match the color of your childs existing frames and everything will look and fit perfectly. We strongly recommend replacing your childs head-strap every 3 months to ensure optimal hygiene.