well designed with fun decals & manufactured to international standards. Come with a unique red saftey light at the back. Flashing light lasts for 20 hours flashing. User replaceable 2× AG3 cell batteries
Medium: 53–58cm (21 – 23") ideal for ages 5–14
How to Measure: Simply wrap a measuring tape around your head starting about an inch above your eyebrows and encircling the widest part of your head.