Ergonomically designed for all forms of road riding, the Nucleon PLASMA Divided Chest Protector Insert has been engineered to be lightweight, breathable, comfortable and protective and is purposely designed to fit inside all Alpinestars jackets. This innovative PLASMA-M design features extensive perforations for maximum air circulation and heat dissipation, offering a soft yet robust back. It is compatible with all current and previous Alpinestars garments. Article: Alpinestars Nucleon Plasma 2-Piece Chest Protector, black-red, Size S for Men.