Born from a long experience in sports competitions. Particular importance was given in the development of XR1 to the use of biocompatible materials, for food use, which comply with international regulations. The polyamide cap, unique in its category, is impact resistant even in cold winters. The medical polyethylene bottle is free from unpleasant odors. The cap is equipped with a protective cover, useful in the extreme off road. The design has been studied to improve grip.