Jimmy Fund “Conquer Cancer” Baseball Cap. This red cap/hat is made of 85% acrylic and 15% wool. It has a Velcro closure in the back to make it adjustable and 6 vent holes in the top. Very clean! If you are not familiar with The Jimmy Fund, it was established in Boston in 1948 and is made up of community-based fundraising events and other programs that benefit Dana-Farber Cancer Institute.