1 fish 2 fish red fish blue fish

Editions are available in English and Spanish.

Materials vary by size: examples show 60% cotton/40% polyester for kids and 90% cotton/10% polyester for adult women's and men's options. Care guidance lists machine wash and line dry (or lay flat to dry).

The shirts feature the Spanish book cover with the wording "Un pez, dos peces, pez rojo, pez azul" printed across the front.

It uses simple words, playful rhymes, counting, and opposites, paired with colorful illustrations to encourage early reading and independent practice.

Both editions list the same height (9.1 inches) and depth (0.4 inches), with widths shown as 6.7–6.8 inches and the same weight (0.55 pounds).

Reviews praise the book as a classic and engaging read for children, noting simple child-appropriate phrases, occasional charming illustrations, and suitability as a gift.