Main function: Baby Head Helmet——The No Bumps cushioned bumper bonnet is specially designed to suit most infant's heads,while offering maximum safety and comfort. For your active kids who are learning to walk on hardwood floors, tiles, patios or near hard furniture can cause painful accidents. The helmet is ideal for babies who are still less than sure-footed when developing their newfound mobility. Lightweight: Our helmets are made to protect your child without adding unnecessary weight. Weighing at just 2.39 ounces,this light and durable bumper bonnet includes a soft,cotton chin strap to keep it secure. Breathable & Materials: The outer shell layer consists of a cotton/polyester blend and high density,odorless,elastic sponge filling. Our special cotton and polyester blend makes this helmet perfect for your child.