Adjustable Size: Helmet for toddlers running infant helmet for crawling walking protective cap is adjustable, and baby helmet for crawling walking suits for baby age 8-60 months and head circumference 16.9”-22”Cotton Material: Weighs just 3 oz with thickness an inch, baby helmet protective caps are lightweight, sweat-absorbent, breathable and soft to protect the little babies. The outer layer is made of cotton, the fill-in layer is a high density and elastic sponge free from smell. The sponge offers shock-absorbing and can reduce the impact force when hit in daily useProtect Baby’s Head: Safety baby helmet offers most ideal protection when toddlers learning to sit, walk, crawl or play. The head cushion can effectively protect the baby during the collision and the friction caused by the bump and fall. The bumper bonnet does provide a shock absorption, impact resistance and cushioning effect, prevent or reduce injuriesAdjustable chin strap allows you adjust the level of tightness to fits your baby’s head better, and ensures hat stay-on right place when baby crawling, playing and walking or pulls.Keep clean is important to the baby/toddlers, the baby helmet is washable with water and there will not be any deforming after repeated washFoam Material Inside