After enduring nearly all of last year (my first with a surf ski) “bareback”, I put in an OceanPaddlesports 1/4” thick pad and really like it. The dense, firm foam is enclosed in a 4-panel nylon cover that conforms to the bucket of my Nelo 520 S. It came with a strong sticky backing that is holding up so far.
Before that pad, I had developed what must have been bursitis of the sit bone area. Bad enough I had to keep taking butt breaks. Some tweaking of my footbrace position and other ergonomic experimenting helped, but once those two bursa were inflamed, even trying a used Epic pad that MCImes kindly sent me didn’t solve the problem. When I swapped it for the OceanPaddlesports one, that felt better, but I knew the real test would come this spring. The yearly forced time off from paddling (winter, hard water) gave the butt time to recover.
Verdict: This pad is a keeper. VERY glad I bought it! No need for butt breaks at all now, no pain, and my wetsuit slides well enough on it. Just be sure where you want to stick it. I somehow got lucky with where I installed it—no complaints. Stability in this ski was ample bareback AND still is.