The most important question when choosing a thick nap mat for children is it a 2″ thick? If you only allow 2″ thick nap mats in daycare, most preschools and kindergartens only allow this in their classrooms. You might also check with your local rules about the length of time the nap mat must be used. Also, look at the actual thickness of your new mat. Often times, the mat is just over an inch thick and then the cover makes up the remaining half-inch.
If you have a larger family, you will probably want to have a thicker nap mat in the kitchen or even in your living room. But remember that some smaller tables have no legroom to allow a long thicker mat on them. Some tables have understructure legs that do not have any room for a large one. It will still be necessary to have a smaller one than the table to make room for the thick one. For this reason, you may want to consider getting a longer one that has more padding in it. This way you can spread the weight of your child out over a larger area of the table.
If you have a large family and are planning to use the same thick one at every table, make sure it is weatherproof as well as being able to withstand the heat of the sun. In order to get a good idea of how much the actual thickness will be, you should measure the length and width of the table as well as the area where you plan to place the pad. Also, measure the actual thickness of your new one. It is best to get a quality nap mat so that the material can take the weight of the child while allowing the room for the cover. This will also help keep the child safe from the weather. Some companies offer a lifetime warranty, which is good if you want to protect your investment. Other than the covers, there are many other features to consider such as safety and style.