Alpinestars Evolution JacketThe Alpinestars Evolution Jacket takes mountain bike protective gear to a whole new level. The Evolution Jacket achieves newfound levels of comfort through its strategic placement of lightweight, anatomically profiled padding. The precision engineering delivers mobility, protection, and comfort in a slimmed-down profile that can be worn underneath your jerseys. Not only does the Evolution provide its own system of protection, but it's also designed to accommodate additional body protection including, Alpinestars elbow protectors and a replaceable Level 1 CE-certified back protector. Additionally, a cleverly placed back pocket is designated to house your hydration pack, making it so you no longer need to wear you pack on top of your padding.Alpinestars Evolution Jacket Features:Removable and replaceable Level 1 CE-certified back protector.Multi-material streamlined design for superior body fit which enables top to worn under jersey.Lightweight, stretchable mesh main construction with breathable padded inserts.Strategically placed panels to ensure the vest remains well fitted.Removable, slim-profiled, lightweight shoulder protectors.Ergonomic back protector follows natural curve of the back.Back protector pocket can also house hydration pack.Front and back conduits for hydration pack hose.Rear kidney compartments for convenient access.Full length main front zipper for easy in and out.Soft chest and side padding is reinforced for added impact absorption and comfort.Short-sleeved styling allows for use with Alpinestars elbow protectors.BNS compatibleAlpinestarsSizingSizeSmallMediumLargeX LargeChest (cm)94-9898-102102-106106-110Outer Arm (cm)57-5859-6061-6263-64Waist (cm)80-8484-8888-9292-96Height (cm)172-175176-179180-183184-187Chest: Measure around the fullest part, under the armpits, keeping the tape horizontalArm Length: Measure from shoulder (Humerus) to wristWaist: Measure around the natural waist line, inline with the navel, keeping the tape horizontalHeight: Stand against a wall, ask someone else to measure from the floor to the top of your head, keeping the tape vertical