Developed in conjunction with Deaneasy, the Vittoria Air-Liner Tire Insert is the ultimate tire accessory for mountain bike tires. This innovative foam base tube insert for tubeless tires is easy to install and protects the edges, strengthens the overall grip and prevents punctures on the roughest and strongest trails. Made from a new generation of polymer, the technical foam airliner reduces tire pressure, prevents burping and bead breaks, absorbs high frequency vibrations and ensures a smooth ride. Although this polymer is slightly dense, it is not very heavy and has excellent resistance to rockins and trail debris. 2 continuous curves- one on top and bottom - run around the length of the airliner to keep it sealed and provide more support for your tires. In addition, the included zip tie and foam has smooth cutting capabilities to make installation a breeze.