Injected Plastic Ball Versatile Urban Style: Rock this Bern helmet adult on your bike. This Bern bike helmet men & women is a perfect fit for cycling around town Comfy And Cool: Stay fresh with 13 air vents, keeping things breezy as you ride through the city or on your mountain bike Flexible Fit: Swap out the moisture-wicking liner or add a light for night rides, this biking helmet is adjustable for all-season comfort Signature Look: Our Bern Brentwood 2.0 bike helmet is designed to stand out from the crowd, making this Bern adult bike helmet a top pick for bike helmets and smart helmets alike Trusted Gear: Known for quality, this adult bike helmet is designed to keep you safe and comfortable during biking adventure