The O'Neill Gromtag is the junior version of the Surftag National Series offering junior surfers the chance to compete under the exciting tag team format. Each Boardriding Club is represented by five surfers made up by 4 under 20's and one under 16.

The 2008 O'Neill Gromtag will carry a $3,000 prize pool with the overall winners receiving $1,200 as well as a vmoto scooter valued at $3,000. Twenty five teams are expected to contest the event with top Australian juniors Davey Cathels and David Vlug (North Narrabeen), Nick Riley (Queenscliff), Tom Salverson (Werri Beach) and Chris Salisbury (Avalon) set to represent their local Boardriding Clubs.

The Gromtag was first held in 2004 with Maroubra claiming victory ahead of runners up Queenscliff who finished on top in 2005. The event was not held in 2006 and made a welcome return in 2007 as the O'Neill Gromtag  which was  narrowly won by  North Narrabeen
ahead of Curl Curl, Avalon and Dee Why.

In relay style each surfer catches three waves and then returns to the beach to tag their team's next surfer. Heat duration is one hour with four teams contesting each heat, bonus points are on offer for each team's fifth surfer returning to the tag area on the beach. The top two teams from each heat progress to the next round.