XTrak is a 4 wheel Spinner luggage that is made from a Polycarbonate composite. To further enhance the durability of XTrak luggage is the inclusion of the metal corner guards; keeps your luggage and valuables safe and secure. Polycarbonate is the same material used in the making of Bullet-proof glass. It is both durable and flexible so that when under stress, it flexes to absorb the impact and then afterward flexes back to its original shape. All three sizes are expandable to give you up to 20% more packing space when needed. It also has a push-button telescopic handle system and has a fully lined interior with a divider. Each case is equipped with a flush mounted built-in TSA lock fixed to the body of the luggage to ensure your contents are kept secure during your travels.