We recommended wearing a helmet at all times while cycling. No helmet can completely prevent injury, including concussions, in every type of cycling accident. Some portions of helmets with an insert, such as the perimeter portion, will have properties similar to EPS helmets. The WaveCel insert of Bontrager XXX, Specter, Blaze, and Charge WaveCel helmets covers the front, rear, top, and sides of the internal area. The WaveCel insert of Bontrager Starvos, Rally, and Jet WaveCel helmets covers the front, top, and sides of the internal area, while the rear is EPS and may have properties similar to EPS helmets.