Volcanic Gecko T-Shirt Black T-shirt with brown Lava Dye print giving this T-Shirt a volcanic rock style. On the back of T-shirt there is a Large silhouette of a Gecko, and on the front left a smaller one on the . Great gift for Dad this Fathers Day! 100% Knit Cotton T-Shirt. Available in Adult Sizes Small, Medium, Large, XL, and 2XL.(2Xl add $1.00 extra) All sizing is Per Manufacturer.