Road tested and Australian and New Zealand standards AS/NZ S1698 approved. F itting a Helmet Proper fit is vital to the performance and effectiveness of any helmet. With the chin strap securely fastened, the helmet should not be able to roll forward. If it can, it is too large. The inner lining of the helmet should fit snuggly all the way around the head. The helmet should fit as tightly as can be worn comfor tably, because the helmet’s inner liner will compress with use. If there are gaps or pressure points, tr y on a different size.