The Alpinestars NUCLEON KR-1 hybrid back protector incorporates race-oriented back protection certified Level 2 to the latest back protector standard. Superb ergonomics and ventilation features make this extremely lightweight protector ideal for street or performance riding. Features Back protection certified Level 2 to the latest back protector standard revision (prEN1621-2:2014) Featuring hard shell vertebrae protection and high energy absorbing viscoelastic memory foam, this innovative hybrid back protector is uncompromising in safety and performance Ergonomically profiled for sport riding with superb ventilation features - the NUCLEON KR-1 is extremely lightweight and breathable