Domestic long hair red tabby though could be solid red since I don't see very defined striping. Leaning to tabby because I see lighter "goggles" around the eyes and a lighter colored chin area. The pattern is probably just difficult to ascertain with all that floof.
I don't see any evidence of a specific breed but he/she is gorgeous!
Red solid DLH, may have British shorthair/longhair or even Persian ancestry, as the muzzle is bracy, which isn’t typical for cats without breed ancestry. Probably a mix, though may be a very pet quality British Longhair.
He is officially with no papers/ history a dlh red tabby or solid. I also think he has persian or BS ancestry from his face. He is a cutey and a beauty