Amazon.com The Brentwood The Brentwood is Bern’s most popular bike helmet for men, featuring a removable visor (patent #US D572880 S), sunglass channels for fitting your shades and airflow channels to keep you cool. Technology Bern’s exclusive Zipmold® foam is a liquid foam injection process that provides a better weight to strength ratio so Bern can provide customers with a lighter, lower profile helmet. Zipmold® hard foam meets ASTM F 2040, CPSC and EN 1078 standards for bike and skate. Bern Unlimited Bern Unlimited is a lifestyle action sport company specializing in head protection for non-motorized action sports. Bern is passionate, focused and committed to providing skaters, snowboarders, skiers, bikers and wakeboarders with adaptable All Season head protection that fits each rider’s individual personality and style. Bern also offers action sport enthusiasts other products that promote and complement their lifestyles. Bern’s mission is to deliver products that action sports participants want before they know they want them. Through new designs, engineering and development, Bern has driven the evolution of head protection. These key Bern differences are designed to enhance your performance, comfort, quality, style and the overall experience of doing what you love to do. All Season Bern’s unique, customizable All Season interchangeable liner system allows you to use your lid year round. Just snap the knit of your choice into your lid. From breezy summer visors, to toasty winter knits, to Bern’s high quality “8tracks” audio system, we have you covered for any adventure. Fine tune the airflow of your Bern lid with the included vent cover and attach your optical gear securely with the detachable goggle clip. Zipmold Polycarbonate (PVC) shell with liquid injected Zipmold hard foam.Shell: Tough PVC thin shell exterior Impact Foam: Liquid injected Zipmold interior for high-impact protection Features: Engineered with a tapered edge and seamless finish. Ultra-lightweight Zipmold technology provides a high strength to weight ratio. Standards: Complies with CPSC, ASTM F 2040, EN1078