Skillbuilders Head protector soft-top medium (20-1/2 - 21-1/2 ) A protective helmet should be worn to protect the special needs person from the dangers of physical activity potential strike hazards (floor wall furniture etc.) self-abusiveness seizers and spasticity. The washable soft-top helmet protects the front back and side of the head. Outer covering filled with shock absorbent material. Helmet comes with an adjustable Velcro chin-strap to keep the helmet in place. - Assembled product length: 20.5-21.5