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Since its launch in 2010, Wear A Hat Day has raised more than £2.2 million to support scientific breakthroughs in our Research Centres of Excellence.
So, whether you favour a fedora or a fascinator, a beanie or a beret, by wearing your finest headgear and taking part, you can help bring hope to the one in three people who knows someone affected by a brain tumour.
You can make an even bigger impact when you invite other people to get involved and spread the fun as well as awareness of our cause.