Quality: Standard boys' underwear. I can tell that these are not the "cheap kind" with thin material that will wear out or quickly have issues. They are exactly what I would expect in terms of good fabric and seam quality.

Design: Really cool if your child likes Angry Birds. They are very colorful and fun.

Sizing: Seems to be right on. I bought them for my (tall) 6-year-old and they are just a tad loose.

Completely recommend.