For the color of the product, please look at the detail frames. Colors may vary during concept shots due to the difference in light. It's made of 100% cotton combed knit fabric, The waist is elastic, Shoulder snap fasteners up to 2 years old. There are no snaps on the shoulders after 2 years of age., Our product is a 4-pack, consisting of 2 upper and 2 lower. It's a pajama set