I don't know what it is. Maybe it's because of the humid climate we live in. All I know is that we go through one of these about every two years and every time we get one they improve it a bit. So this is the best we've ever had, and also the third we've ever had.
Cordiant Road Runner 195/65 R15 91H summer
24 Review
SuperJump Trampoline with SuperJump 8ft (244 cm) net and ladder
29 Review
4WD ORCISH Recovery Traction Boards Tracks Tire Ladder For Sand Snow Mud - Set Of 2 (2Nd Gen Bag + Mounting Pins, Black)
39 Review
Nokian Tires Hakka Green 3 205/55 R16 94H summer
37 Review