Kid's Bicycle Helmet 9 Holes Riding Equipment for Boys and Girls,suitable for 2 to 15 Years Old Child with Head Circumference 40-55 cm and the Head-width below 16.5 cm Please refer to the pictures for the comparison of the products. 9 flow vents to keep your kids feel cool during riding Heat sealed pads for comfort and durability Side strap adjusters assist with a proper fit Shipped from LA via USPS, it will take 2 to 7 working days for shipping.