Dainese Rebel Jacket The highest performance and technical content are expressed by the assertiveness of this cowhide jacket. Elevated safety in the Dainese Rebel Jacket is provided by the homologated, non-removable protectors, shoulders with co-injected titanium inserts, and the ability to add an optional back protector or an optional Thorax Chest Protector in the built-in pockets. Comfort in a variety of conditions is ensured by the removable thermal lining, air vents on the chest and side, a silver ion treated liner, elasticized inserts, side adjustment and a jacket-to-pant fastening zipper. Perforated leather good for warm weather riding Composite protectors certified to EN 1621.1/97 Standard Co-injected shoulder with titanium insert Cowhide leather S1 Fabric Inserts in elasticated fabric Elasticated inserts Collar with elasticated insert Jacket-trouser fastening system NanoFeel liner Removable thermal liner Air inlets on the chest and sides Pocket for Wave G1 and G2 back protector Aerodynamic spoiler Soft inserts Reflective inserts 4 outer pockets 2 internal pockets Pocket on removable liner Pelle perforata (Italian patent pending) Denoted 'Dainese Rebel Pelle Estivo' in Dainese's catalog
can you explain how to take the sleeve measurement for this jacket please