The Alpinestars Nucleon KR-R Cell Back Protector is an innovative CE-certified Level 2 track and race back protector.Developed in three waist-to-shoulder dimensionsHigh performance polymeric material blend cell structureExtended lower back protectionHighly perforated and breathableErgonomically designed to contour the natural curve of the back for optimal fitHorizontal flexion groovesCompatible with the Nucleon KR-TB protectorHeight-adjustable kidney beltSoft bio-foam padded chassisThe Alpinestars Nucleon KR-R Cell Back Protector has been constructed from a high performance polymeric material blend which is optimised for flexibility and has excellent weight saving properties. The protector is highly perforated for maximum breathability and ventilation.This protector is CE-certified to Level 2 due to the high level of protection available. There is an extended lower back protector which offers more protection for the rider, and a height-adjustable kidney belt featuring dual hook and loo