The new Alpinestars A-1 Plus Chest Protector bib has a new and innovative button closure with elastic that you can easily stretch around the waist and attach to the chest. The fit is very thin and comfortable. With a protection that fits like a second skin, you don't realize you're wearing it and the safety level is maximum! The protection is made of lightweight, perforated, flexible and resistant hard plastic. Under the plastic panels there is bio-foam for shock absorption. These features contribute greatly to the safety and comfort of protection (especially on hot days, as the holes in the panels make the protection very ventilated).