"When Des did Sweden last year, he said he was the only Maori, so we hope to inspire others that anything is possible."
The other member of the group is Piripi Rangihaeata from Wellington.
They've got a special kit made up so other competitors and spectators can recognise they are part of the same team.
"I'm excited to be participating as Maori in a team travelling together," said Webber.
An Ironman is a 3.8km swim, 180km cycle and 42.2km run.
Webber competed at Ironman New Zealand this year, and Day made her Ironman debut at last year's Taupo event.
"This is about taking part and encouraging others. It's about having a big goal, especially when we're going to the other side of the world," Day said.
"Denmark would have been the last place in the world I would have picked to visit, but if someone offers you a wonderful opportunity, you have to take it and work it all out later.
"We are all late bloomers when it comes to triathlon, I often wonder what I would be like if I'd started earlier."
Warbrick said she was devastated to have had to pull out, but she was determined to recover strongly and get back on her bike.
"It's back to the drawing board and I'll reassess my goals. There's always another event."