Is glossy caramel fleece an example of oxymoron?

No, "glossy caramel fleece" is not an example of an oxymoron. An oxymoron is a combination of contradictory terms, like "jumbo shrimp" or "deafening silence." In this case, "glossy caramel fleece" is just a description of something that combines different qualities (shiny, caramel-colored, and soft).