Why does Steinbeck mentions the fact that slim combs his hair?

Steinbeck mentions that Slim combs his hair to highlight his meticulous nature and the care he takes in his appearance, which reflects his confidence and status among the other characters. This small detail serves to establish Slim as a figure of authority and respect on the ranch, contrasting with the rough and rugged lives of the other workers. Additionally, it underscores themes of masculinity and self-respect within the context of the Great Depression.