Prince William and his wife Kate Middleton, and younger brother Prince Harry will launch their Heads Together campaign at the iconic Queen Elizabeth Olympic Park on May 16. The royals have come together for their “biggest project” ever that strives to put an end to the stigma associated with mental health. It is a cause that is close to the hearts of William, Kate and Harry.

The Duke and Duchess of Cambridge and Harry will speak about their personal interest in the campaign and will set a target of what they want the campaign to achieve. The trio will work with seven mental health charities. They will be joined by campaigners, beneficiaries and ambassadors from the team of mental health charities.

The campaigner with their expertise will make William, Kate and Harry abreast of the methods and ways they will use for the Heads Together campaign. The charities with which Will, Kate and Harry will work include Best Beginnings, The Campaign Against Living Miserably (CALM), Contact (a military mental health coalition), Mind, Place2Be, The Mix, and YoungMinds. Kensington Palace announced in April that the three royals have come together for the Heads Together campaign.

A picture released by the palace showed the trio wearing blue headbands. “Mental health is just as important as physical health,” said Kate in a video. Harry said that they all could play their part by talking and listening to each other and helping each other find support. Meanwhile, William asked everyone to join hands for mental health.

Heads Together has been made 2017 Charity of the Year by the Virgin Money London Marathon. This is the first time that the London Marathon has chosen mental health as a cause. Catherine Roche, the chief executive of Place2Be said they were “delighted” to be part of the campaign. Besides, Paul Famer, chief executive of Mind added that mental health is a stigma that needed “long-term commitment,” People reported.