Made of medical-grade rubber, hypoallergenic, soft and comfortable for kids.This stretchy band with two sizes [small size: 5.7 inches(145 mm), Large size: 6.6 inches (170 mm)] fits most kids age at 4-8. WE RECOMMEND THAT YOU BUY THE SMALL SIZE FOR YOUR KIDSVarious colors available to wait for your choice. A nice way to make children's world more colorful, increasing their sense of color as well.Our Garmin vivofit junior replacement bands adopt human ergonomics design, are perfectly fits kids wrists. Special design for your kids.ALYLY provides 30-Days unconditional money back and for 6 months after the date of purchase,we take care of all quality-related issues with a REPLACEMENT OR FULL REFUND.Please don't hesitate to contact us.