These Jumping Surface for 14' Round Trampoline receive a new layer of fabric over the V-ring stitching to protect against the sun damaging the stitching, which is one of the main reasons for replacing mats. The stitching is normally exposed to the sun and they eventually wear down faster than the jumping mat itself. This can be problematic because the v-rings need the reinforcement of the stitching in order to stay intact. With our mats, the stitching will be more durable and v-rings will take a longer beating from children pouncing on the mat.