The foundation of the Royale is our proprietary "fin" shaped rand designed to make maximum contact with the rim and resist implosion to the very end. We place two sticky patches under the deck on the sides to provide additional implosion resistance. We also extended the deck neoprene 2" past the rand to offer unsurpassed dryness. All of the seams are glued, taped and stitched. Supratex 2 neoprene deck and Schoeller Keprotec Kevlar rim reinforcement.