You should only buy a helmet that meets the bicycle helmet safety standards of the US Consumer Product Safety Commission (CPSC). Any helmet meeting these standards is labeled. Check the inside of the helmet for confirmation.
All helmets manufactured or imported for use after March 1999 must comply with a mandatory safety standard issued by the CPSC.
Each type of helmet is designed for protection in specific conditions and may not offer enough protection in bike crashes or falls. Bike helmets are very protective in headfirst falls at fairly high speeds and are light and well ventilated for comfort and acceptability. A multisport helmet, certified to meet the CPSC standard for bicycle helmets, is also acceptable.
Helmets meeting CPSC safety standards are available at bicycle shops and at some discount, department, and toy stores in adult, children, and toddler sizes and styles. If you buy a helmet online, buy from...