Show your pride for your Alma Mater, Cal Poly Humboldt with this Humboldt Lumberjacks Alumni Shirt. You've worked hard to get where you are so let everyone know how proud you are of your degree while sporting this stylish Lumberjacks graduate tee shirt. Sport Your Gear in this Cal Poly Alumni t-shirt and know that we are always using an environmentally friendly process and ink. NOTE: Heather colors are a cotton/polyester blend. Solid colors are 100% cotton.