Mares has designed the second stage HR, for the purpose of enriching their offer with a simple item, yet fitted with important features. The technopolymer body makes it ultra-light, and offers it a very important aesthetic character. Regulations on the respiratory effort and the possibility of being open underwater places this device in the world of technical diving. Finally, its flexibility in use makes it highly sought after in the market for: stage, sidemount or inserted in backmount configuration.