As well as being sampled at the magazine's action sports events, the brand will sponsor some of the UK's rock music festivals next year.
Marketing spokesman Simon Hawkins said: "Relentless has been embraced across the core action sport and music culture that inspired its positioning, and the brand message is moving into the mainstream where the energy-needy are buying into the brand's No Half Measures approach."
Relentless is sold in a 50 cl can and targeted at 18
to 35-year -olds who feel that one can of 25 cl energy is not enough. On-pack messaging will be enhanced on single packs to give more prominence to the No Half Measures message, Hawkins said.