"Both supported us when times were tough, and both have been with us for 10 years.
"We couldn't have done it without them."
Graeme and Stephen Ricketts, along with their late father Derek, had been looking for an opportunity to give back to the Hawke's Bay community, and sponsoring the park was able to fulfil that vision.
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The brothers said users of the park are heavily subsidised from a range of sources, and the sponsorship will help keep it that way.
"Affordability is a big issue for young families and assisting them through sponsorship is a great way for us to invest in the community."
The company has a five-year history with the Sports Park, the first Mitre 10 Tough Kid event was held in 2014, with 600 school children taking part that year.
The park's CEO, Jock Mackintosh, said the sponsorship was one of the most important things to happen at the park.
"It underpins us financially for the larger maintenance type expenditure that starts to kick in after 10 years of operation.
"We'll still need to raise funds, but we are in a much better shape to meet those challenges."