Hmmm, .....that is odd. It is probably a slight grammatical or contexual error based on the langauge gap.
Open cell is split neoprene and has the look and feel of a smooth sponge with micro pores. Slickskin is closed cell neoprene and has a shiny smooth finish. Many pure freediving suits are open cell inside with a slickskin
exterior. A suit with slickskin interior will keep you warmer than a suit with a nylon interior, but not as warm as a suit with the open cell interior.
Here is a pick of a Yamamoto 45 freediving suit with the slickskin exterior.
