What is a F.U.Z.E Zip entry? F.U.Z.E Zip is the chest zip entry to the wetsuit. Based on O'Neill's patented Z.E.N Zip system, this allows for a zipperless free-floating feel and more paddle flexibility. See also: How to put on and off a F.U.Z.E. entry wetsuit? Related articles What is a Z.E.N Zip entry? What are the main differences in the Psycho Series wetsuits? What is O'Neill Blue? What is TechnoButter? What does the thickness mean in a wetsuit?