G-Form MX Spike Chest Back Shirt Stay Protected It's always recommended to wear protection while you're doing crazy rides on your mountain bike. Many riders want a chest protector that is flexible and isn't bulky so they can ride without being held back. The G-Form MX Spike Chest Back Shirt is made with G-Form's RE ZRO pad that is fully biodegradable and 100% recyclable. The pad is ventilated and is highly flexible. It features a full-length front locking zipper with reinforced seams, breathable moisture-wicking fabric, side elastic straps, and integrated elastics to secure a neck brace. Features RE ZRO pad that is ventilated, flexible, and removable Breathable moisture-wicking fabric offers comfort and exceptional performance Side elastic straps provide customization to ensure optimal fit RE ZRO CE 1621-2 Level 2 Back Certification and RE ZRO CE 1621-3 Level 1 Chest Certification Full-length front locking zipper with reinforced seams Sizing Size Small Medium Large Extra Large Measure Chest Around Widest Point (in)32 - 36"36 - 40"40 - 45"45 - 50"Measure Chest Around Widest Point (cm)81 - 91. 5cm91. 5 - 101. 5cm101. 5 - 114cm114 - 127cm | G-Form | Mx Spike Chest Back Shirt Men's | Size Large In Black