The lightweight Launch Plus offers the easy-wearing benefits of the Launch helmet amplified with kid-friendly 2D design. Underneath these playful designs are our finest performance technologies - the Launch Plus comes equipped with the In-Form Fit System, allowing up to 2.5 of adjustment. The bonus of a soft interior and Super Cool Vents keeps kids comfortable all day long. Sizing (Small): 20.50 - 21.75 In-Mold Construction In Form Fit System, Vertical Tuning Super Cool Vents Seamless Compatibility with Giro youth goggles (Rev & Chico) Certification: CE EN1077