Please see the pictures for size instruction. Then, to choose the right one, you should measure your previous trampoline pad. Heavy-duty 500D x 500D (18oz) PVC, anti-UV and harsh weather, durable, not easy to get deformed. Top vinyl: PVC methane 500D x 500D (18oz)Bottom vinyl: 130gsm polypropylene.Others cheap PE cover can't stand exposure. 13 Inch (33cm) Super wide cover pad, much wider than most other pads in the current market! Can cover almost all length springs safely and comfortably. 0.8 Inch (2cm) Thickness EPE Foam, 4 Inch (10cm) deep side skirt overlaps full trampoline frame. Secure straps provided, Anti-fungal/anti-bacterial coating.