Instructions to attach multiple mats together are simple, and vary among what kind of mat you have. If you have folding mats, these mats have Velcro flaps on each side of the mat. To attach mats, you Velcro one edge to the next until you have your desired shape or size. If you have rollout mats that you would like to attach, you would apply mat tape along the edges of your mats and secure them together until you have the desired size or shape.