Shoes in it. I just wear the shoes around the house. Holds four pairs of my shoes per shelf. they are by far the best sounding ANC headphones I?ve listened too so far. They stack solidly or work fine side-by-side. I got size womens 9 mens 7 and they fit me perfectly i normally wear a 9 in every shoe vans for reference I wanted something different that was tall and thin since we dont have a lot of floor space. is a great unit but I wanted more features. Here is the detailed review. If your ears are not too sensitive, this is a perfect product for you.