To me, a seamless chamois is a chamois that is all one piece, so the only stitches are the ones around the edges to attach it to the shorts. I think most are like this now. Years ago I had some PI shorts with a chamois that was multiple sections sewn together, and then sewn to the shorts around the edges. So you ended up with seams between you and the saddle, sometimes in high-chafe areas -- very uncomfortable.
- Gray 2010 carbon WSD road bike, Rivet Independence saddle
- Red hardtail 26" aluminum mountain bike, Bontrager Evoke WSD saddle
- Royal blue 2018 aluminum gravel bike, Rivet Pearl saddle
Gone but not forgotten:
- Silver 2003 aluminum road bike
- Two awesome worn out Juliana saddles