The O'Neill TNT Comp Vest is compression molded and sports O'Neill's patent-pending floating zipper closure which minimizes foam bulkiness, maximizes adjustability and fit, and hides the belts for a cleaner look. O'Neill assured the TNT Comp Vest's flexibility was huge by crafting it from segmented panels to help the TNT work with you, not against you. Strategic drain holes keep the water flowing, too!