The Vissla's North Seas 5.5/4.5 Hooded Chest Zip Wetsuit is the perfect wetsuit for those looking to tackle frigid environments. Made from the lightest, warmest, & stretchiest Japanese limestone based neoprene available, the Vissla North Seas 5.5/4.5 Hooded Chest Zip weighs significantly less and is noticeably more flexible than most suits of similar thickness. The new and improved fit includes anatomically engineered body lines with minimal seams for unrestricted performance and warmth. The chest-zip entry with Cris-X interior panels make for an easy entry and minimal bulk. The body is lined with hollow fiber Fever Fiber which has amazing insulation that not only keeps you warm but dries fast. The anti-fade stretch jersey is laminated with A quaA which is an eco-friendly water-based lamination that is completely solvent free. The Power Seam is an advanced, flexible, waterproofing sealant used on the outside of all seams for added warmth and durability. The Vissla North Seas 5.5/4.5 Hooded Chest Zip Wetsuit is the warmest and most watertight suit offered by Vissla.