There are full mats that can cover a room's floor. These are great as toddlers like to move freely. Conversely, many mats are only a few feet wide. This is excellent for older kids who like to cartwheel and tumble. You also have the option to build a playmat that will fit in any room. Modular tiles, often 2 x 2 feet and about an inch thick, give you this flexibility. Like giant jigsaw puzzles, this type of puzzle mat comes in different colors and patterns.