you make me happy dopamine serotonin funny chemistry t-shirt, White;black

material:cottonsize: s m l xl 2xl 3xlcolor: show as picturewithout ever fading,cracking,peeling or flaking-e using dye-sublimation,a technology that allows 3d t-shirts insanely vibrantstylish special fashion design,beautiful and comfortable to wear it,great for all types of exercise,working out or just relaxing and so on.attention:our size are asian size which is ususally smaller than us size,so,we suggest that you choose a bigger size.package included:7573* printing t-shirt