We purchased two of these mats for our toddler to use for play and tumbling. The hook and loop strips (velcro) are secured well around the perimeter and hold the mats together perfectly. The mats are great quality with a heavy weight durable cover, easy to clean and the foam density is soft enough to protect against tough falls and tumbles, but firm enough for my husband and I to use them as supportive workout mats for yoga and floor exercises. They are also easy to fold back up and carry away with the handles. What a great find.