Applicable age: 6 months - 6 years old baby, cap size adjustable!Size range: even size: suitable for head circumference 42cm-58cmWeight of about 75 grams or so;Scope of application: suitable for infants and toddlers in learning to sit, learn to crawl, learn to walk, and play when wearing.Main material: cotton + white sponge.Hat light weight, adjustable sizeLightweight, breathable and cute baby safety helmet provides optimal protection for toddlers during crawling/playing/walking; head cushion effectively protects baby from friction during collisions and falls. The anti-collision cap provides shock absorption and cushioning effect to prevent or reduce the baby's head injury.Keeping it clean is important for babies/toddlers, and the baby compartment can be washed with water without any deformation after repeated washing.