The Thinline pad is a five piece pad with a small arch in the middle and a 30mm rolled tail kick. As for the construction, it"s all about the compound. Dakine Posi Traction stays grippy in cold water and won"t rub your knees raw in warm water. The specially formulated EVA foam retains its specific density and 100% memory in any water temperature. And DaKine uses the best 3M Pressure Sensitive Adhesive to insure that your pad will never peel off until you want to take it off.