Importing into unity from blender makes my object half-transparent

I made a simple low poly barrel model in blender because I'm trying to learn modelling for a game I'm making in unity, but when I import the file into unity it becomes semi-transparent. The first picture is the model in blender, which looks fine, and the next picture is how it looks after I import it into unity. i opened the file is the windows 10 3d model viewing app and it was perfectly fine there, so I'm guessing its something with unity but I'm not sure