Simpson Hybrid Youth Sport SFI 38.1 - Quick ReleaseSimpson Racing Hybrid Youth Sport The Hybrid Youth Sport with standard Quick Release Tether and Helmet D Rings gives you all the safety of an adult version, but 25% smaller to fit a youth junior driver and child size as young as 4 years old. Functional defined wings for seatbelt containment and a sliding tethers and patent pending multi tether system enhances side to side range of movement and field of vision. With it's lightweight design and DuPont