We at BILLY Footwear are pleased to announce our partnership with IDefine ( where a percentage of all BILLY sales through their channel goes back into their organization. 

I define my future. I will change the world. IDefine is committed to identifying life-changing treatments & cures for those with Kleefstra Syndrome and other Intellectual Disabilities, building community and resources for families.

To learn more about IDefine (, please click here.

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