The head strap and ear adjusters are made with a comfy, stretchy, light, and easily detachable food grade clear silicone material that works with all the sunglasses sizes to get the perfect fit. 

• The head strap will help keep sunglasses on your child’s face to prevent losing them or sliding off during playtime.
• The ear adjusters help tighten up the fit of the sunglasses' arms tucking behind your child's ear so that the glasses don't slide off their face, ideal for those growing into a larger size.