The design with the foam layer in which the bedload can be hided could keep the chamber clean. The design without the foam layer can make water and dirt exude, keep the surface dry and clean, so it is suitable to the outside.
With the soft loop layer, feel comfortable walking on the mat.
The abrasion of the mat with the thick loop is better.
More color, more suitable to the chamber decoration.
Easy to keep clean, just gently flap or bath.