New Kid Kart size for the 360 Plus Device! After researching all the available neck protection choices, we feel the K360 Plus Device and 360 Plus Device offers the best protection at any price level. The K360 Plus Device is designed for the youngest or smallest kart drivers. The new shape allows it to sit down farther on the shoulders of younger drivers so it's not pushing up on the base of the helmet and impeding the driver's vision. Suitable for drivers 5 - 9 years old (and younger at tracks that allow). It may also be worn by slightly older drivers that have a shorter neck that have trouble wearing a neck collar that pushes up on the bottom of their helmet. One of the key safety factors - it's designed to prevent the helmet from projecting over the edge of the Device and creating a fulcrum action. This is a common (and potentially dangerous) issue with many foam neck collars. Major issues the K360 Plus Device helps limit are front and rear hyper-flexion and extreme lateral motion. This is all accomplished while still allowing the driver unrestricted rotation of the head to look over the shoulder for oncoming karts. The K360 Plus Device also has a unique safety feature not found in many other advanced neck protectors - a break-away function on the front piece to prevent neck & throat damage in the unlikely event that something should hook inside the device. Unlike other devices on the market, the front section is designed with foam, versus plastic, to minimize injury to the throat if forced backward. The device also has adjustable under-arm straps to better hold it safely in the optimum position. The K360 Plus Device weighs in at only 1.5 lbs. The device is fully adjustable. The K360 Plus Device is designed for kart racing only. Do not use the K360 Plus Device if your kart has a restraint system. The materials are fire resistant, but not fire retardant. Again, the K360 is for younger/smaller drivers - roughly 5 to 9 years old. For larger drivers we have the 360 Plus Device in two sizes. Approved for use by WKA and IKF INSTRUCTIONS FOR USE The side foam can be adjusted by undoing the One Wrap tie down, and pulling the side foam part way from the core piece at a 45 degree angle. Move it forward the desired distance, and evenly press it back into place. A quick trick is to put a credit card, or similar material, between the Velcro pieces, squeeze the foam into the desired position, and then pull the credit card, or similar material, out. Caution - Make sure to move the strap retainer close to the loose end of the harness strap. Do not leave a long, loose end that could cause a distraction while driving or catch in moving parts.