Alpinestars Nucleon Plasma Divided Chest Protector Insert The Alpinestars Nucleon Plasma Divided Chest Protector Insert combines cutting-edge engineering with lightweight, breathable materials to ensure both comfort and protection. Designed to seamlessly integrate into all men's and women's Alpinestars jackets, this chest protector emphasizes the balance between protective functionality and ease of wear, making it an essential upgrade for riders prioritizing safety without compromising on comfort. Features: Plasma is constructed from Usda certified bio-based eco-friendly and sustainable impact absorbing material Ultra-adaptive, vented and low-profile Nucleon Plasma viscoelastic compound construction for superior rider comfort Constructed with a soft tactile inner liner for additional rider comfort Super lightweight full chest protector insert is developed in three sizes Level 1 CE certified chest protector insert is a composite construction and has a central semi-rigid thermoplastic zone on a Nucleon Plasma chest protector for greater impact force dispersion in a critical area Innovative Plasma M divided design delivers maximum airflow and heat dissipation Soft tactile backing guarantees structural integrity of the protector by preventing any potential tearing Fully adaptive design for maximum comfort Sizing: Men's Textile Jackets SM Jackets fit SM protectors MD+ Jackets fit LG protectors Men's Leather Jackets 46 and 48 Jackets fit SM protectors 50+ Jackets fit LG protectors Women's Textile Jackets XS through LG Jackets fit SM protectors XL+ Jackets fit LG protectors Women's Leather Jackets 36 through 46 Jackets fit SM protectors 48+ Jackets fit LG protectors