Tubeless tyres, also referred to as UST, have the primary benefit of avoiding needless pinch punctures when running at low pressure. They are specifically designed to enable the rider to run varying amounts of pressure to suit the riding conditions. They will require a Tubeless / UST specific rim, or a conversion kit, to be used without a tube. They can however have a tube fitted if they become damaged during use. Special tyre sealants can also be purchased to improve the seal and are applied inside the tyre when installing onto the rim.