Soft cotton material. I wouldn't call it stretchy, but it's a bit pliable. The neck hole is a bit tight, had to pull a little harder than I want to put on my girls head. I washed it, dried it and immediately folded it, but the shirt was still wrinkled. Worse, the neckline is bent! I'm sure a quick iron will fix that, but I can't iron the neckline of my toddler casual shirts on a regular basis! For this reason I will literally not be buying again any zebra spotted brand that I have bought (shirts, dresses and shorts) that is wrinkled and/or folded in odd places (like the neckline) so I will stay away from stamps from now on. As for the rest of the fit, my toddler is 1.5 years old, around 22-23 pounds, and wearing the 2T in the photo doesn't have as much "growth room" as I would like. Most other brands she wears are a 24 month size with plenty of room to grow without looking too big and baggy or she still doesn't fit 18 month but they are narrower. I would say this spotted 2T zebra is about the same size as the Hanes brand 18 month tee found on Amazon. As I said, due to the folds and creases around the neckline, I would NOT buy again, but if I had to, I would take a size up!
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