BobbleRoos nap mat or rest mat covers are made out of 100% cotton flannel in a variety of cute prints. Our nap mat covers are fitted-style sheets designed to fit 24" W x 48" L preschool or daycare nap mats (the actual nap mat mattress is not included and is only pictured for illustration). We designed our nap mat cover with the input of a preschool looking for a more comfortable and durable nap mat cover, featuring large pockets or flaps to help keep the cover in place on the mat. Our fabrics are incredibly soft to create a comfortable nap mat for your child. The cute prints will be enjoyed by your child and will also help to make you child's nap mat unique - ensuring that you child will always sleep on the same sheet each day and your child's nap mat won't get mixed up with others at preschool or daycare. Our preschool & daycare nap mat covers are also available with a matching 12x16 toddler pillow. Note: Our rest mat sheets were designed specifically for the standard size Mahar rest mat (3 section) but work for most mats that measure 24" x 48" - please measure first! Personalization now available!