It Is Easy Being Green t-shirt shows a frog family bicycling, illustrated by Paul Zwolak. All our T-shirts are printed on 100% cotton and in the USA. Proceeds from the sales of the Frogs Are Green products go toward frog, amphibian and environmental organizations. T-shirts come in Kid sizes: Small, Medium and Large. Baby Onesie in 12 month size. Adult shirts come in Medium, Large, XL, and XXL.