You are welcome to use any yarn you like for your hat, we simply request that the yarn be blue and green!

In the promotion of independent creators and small business, we have partnered with a few independent yarn makers to offer Project Thinking Cap custom yarns and hat kits in blue and green. Check out these awesome shops by clicking on the images below.

Pancake and LuLu

Woolly Marmot Yarns
Use code SCIENCERULES for 15% off

Rembrandt arns


Rembrandt Yarns

The Yarn Jar

Ocean Park Yarns