Instonians beat Bready by 36 runs to clinch the All Ireland U15 final at Shaws Bridge.
In a contest reduced to 16 overs per side, Instonians did well to post 110 for 7, an excellent effort given the ground conditions following torrential rain.
Skipper Adam Ly top scored with 37, while Rory Ellerby hit 32.
Brook Crumley and Kenzie Hall took two wickets apiece for Bready.
In reply Bready made 74 as scoreboard pressure told. Nathan McCombe top scored with 28, while Rory Ellerby claimed three wickets for 10 runs in an excellent spell.
The Magheramason side had reached the decider with a six wicket win against Leinster.
Daire Cassidy (69) and Cillian Jacobs (40) helped the Rathmines side to 181 for 9, with Kenzie Hall (5-29) and Nathan McCombe (2-32) the main wicket takers.
Hall and skipper Brook Crumley both scored half centuries in an excellent chase.
For winners Instonians, it completes a remarkable season at youth level for Instonians at U11, 13 and 15 levels.
As well as the U15's the Under 13 side also won the All-Ireland title, while the U11s reached the final before losing to Pembroke.
The youth teams followed up a very successful 2018 with seven trophies this season, including league titles, as well as the Quoile, Graham and Banogue Cups.
They have no fewer than 12 players playing for the Northern Knights representative youth sides, while six players have been in the Irish set-up: Tom Crothers, George Palmer, Rory Ellerby, Adam Ly, James Rose and Amy Hunter.
"There are a number of reasons for our success," said an Instonians spokesperson.
"We try to use young talented, qualified coaches for fun sessions. Our Winter Academy has been a fantastic initiative too.
"Youth Convenor Steven Crothers drives all the youth cricket and has done a magnificent job over the past four years developing some excellent talent. Andrew Rose as club Chairman of Selectors also had a big input.
"The benefits of specialist 1:1 sessions have seen players really develop and grow,
"The support of everyone at the club especially the parents has been a major factor. Everyone has bought in to our vision for youth cricket and we feel we have set the standard for others to follow.
"We are now looking to appoint a Director of Coaching role to have more school coaching and increase participation numbers further."
Photographs courtesy of Instonians CC