I wasn't sure if this will come in a circle or rectangular shape when I ordered it but I'm glad I did! I was very happy to see that it was a rectangular shape and it fits my door perfectly. The material is soft and yes it does trap dirt. The only bad thing about it is that if I put it right below my door, I wouldn't be able to open it but I am willing to let it slide for the price. 

Pros: Great price, good quality, well made, traps dust
Cons: Could not fit under my door