What is a Z.E.N Zip entry? Z.E.N Zip is the back zip entry to the wetsuit. O'Neill's original patented Z.E.N closure allows for zipperless free-floating feel, short zip, and barrier-2 mixed with zen collar to keep out the water. It allows less paddle flexibility. See also: How to put on and off a Z.E.N. entry wetsuit? Related articles What is a F.U.Z.E Zip entry? What is O'Neill Blue? What are the main differences in the Psycho Series wetsuits? What is TechnoButter? How to put on and off a zipless wetsuit?