The Allston is the long awaited cycling specific helmet release from Bern, featuring over 50% more airflow with 16 strategically placed vents. We developed this helmet alongside the world's best cycle messengers, and cyclecross racers, which resulted with a helmet that performs as well as it looks. The Allston is made from Bern's exclusive ZipMold technology resulting in a high strength to weight ratio with a clean finish. Bizarrely, before developing the Allston for Summer 2013, Bern Unlimited had never made a cycling specific helmet. Having owned previous models from the Massachusetts body protectors in the past most recently the companys Brentwood model, which I lost at a roof party in Brooklyn, I was kind of surprised by this fact myself. But for a freshman effort in the velo specific category, the Allston is a star. The Crosby Press. Berns exclusive ZipmoldR 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. ZipmoldR hard foam meets ASTM F 2040, CPSC and EN 1078 standards for bike and skate.