SkyBound Premium Trampoline Replacement Mats with Sunguard and Free Spring Tool Featuring SkyBound's unique Sunguard material which protects your mat's crucial stitching from harmful UV rays and extends the life of your mat by up to 50% compared to trampoline mats without Sunguard! SkyBound's Premium Series Trampoline Mats are manufactured with extra attention to detail, utilize the highest grade materials available in the industry, and come equipped with extra rows of heavy-duty stitching and thicker steel v-rings to boost the bounce of your trampoline! To find your mat, select your specific size based on the 1) diameter of your trampoline's steel frame, 2) the number of total v-rings or springs, and 3) the total length of your springs measured in inches from hook end to hook end. When measuring your springs, it is important that they are off the trampoline, completely unstretched, and measured from the end of one hook to the other (the total length of the spring). Each Skybound Premium Series Trampoline Mat comes with an industry leading 3 year warranty on the v-rings/rows of stitching and a 5 year warranty on the permatron surface (the jumping surface).