All boats are manufactured using the strongest 0.9mm/ 1000 Denier fabric having been specially coated with PVC(PVC Tarpaulin), which is unaffected by gaso and salt water. It's highly resistant to damage from abrasion, impact and sunlight(UV ). It also permits more air pressure for rigidity. And the fabrics are connected by hot air welding machine instead of hand gluing, which makes the boat very strong at seams.