I did not realize when I ordered this rack that it was expandable horizontally. As a result, I ordered too many for my space. Solid construction. but note, this is not for very small shoes, a minimum shoe size would be a ladies 6 1/2 in my opinion. also smooth bottom shoes (e.g. patent leather sole) will have a problem staying put with this rack. You may want to put some Anti-Slip (grip) tape on the cross bars to prevent your shoes from constantly falling down and becoming difficult to retrieve. I would recommend this for anyone with high heel shoes. It is infinitely stackable, but may require some wall straps for anything beyond the third tier.