I had Selle An-Atomica slot my B17 Champion Special about 8 years ago, when the original owner of SAA was still alive. Part of their modification was a bonded thin layer of leather under the original Brooks skin (already Pro thickness on this version). That saddle has been holding up well, and the bonded layer shows no sign of coming off. The SAA Tru-Leather Titanico X that I owned for a while last year also had a bonded on layer.