This Saitama vinyl figure is released by Funko in their POP! Animation x One-Punch Man vinyl figure series.

Funko POP! is a crossover vinyl figure series by Funko and other famous franchises such as Disney, Pixar, DC Comics, Marvel Comics, Simpsons, South Park, Uglydoll, etc. Each POP! figure is about ~3" to ~5" tall and crafted in a Japanese anime/manga super-deformed style (NOTE: due to the unique design of each character, the actual size of the figures may be smaller or bigger than stated).

The POP! Animation x One-Punch Man features characters from the superhero parody manga/anime, which tells the story of Saitama, an extremely overpowered superhero, who has grown bored by the absence of challenge in his fight against evil and seeks to find a worthy opponent.