Alpinestars Youth Neck Support Black White One Size 1SRS LFC Technology: Our proprietary Lateral 13087 1138 LFC Technology: Our proprietary Lateral Flex Control (LFC) technology provides essential lateral flex stabilization For 2 Stroke Engines: Complete Piston Kit • The rear stabilizer system helps to keep the support in position and is also designed to channel extreme energy loads away from the spine by transmitting it across the shoulder and helping to avoid serious spinal injury the support has been proven to help reduce the most serious damage and minimize the risk of collateral injury as the impact load is channeled away from the neck