The O'Neill Slasher has just gotten an upgrade for 2021. It is now lighter, stronger and dry faster than ever. With Nytrolite Foam Technology. Is 3x lighter than PVC foam. The Closed cell foam structure absorbs 15-20% less water. Making this vest for 2021 approximately 10% more buoyant than PVC meaning the use less foam in each vest with the same floataion Anatomical Flex Points Strategic Seam Placement Front Zip Reversible NytroLite Foam Technology UltraFlex Combination.