Our trampoline mats, made from premium PERMATRON fabric, boast UV protection and durability. Constructed with carbon-loaded polypropylene for high tensile strength, these mats excel in extreme climates. Specifically designed for a 15-ft Octagon Frame Size with a 13-ft Mat Size using 104 V-Rings (8.5" Springs), they feature 6 rows of stitching for secure v-ring placement. Withstanding sun, rain, and cold without deterioration, this fabric is incredibly strong and long-lasting. It is compatible with various trampoline brands, including JumpKing, Leisure Kingdom, Hedstrom, Wal-Mart, Costco, and many others. . . . How to Measure: 1) Detach a spring and measure from tip-to-tip of hook 2) Count the spring holes on the frame 3) Measure your trampoline frame from farthest corner to farthest corner to determine your frame size . . . . Note: 1.This is not infant toy, please take away from children to avoid eating. 2.Please allow slightly errors due to manual measurement and different monitors.