The only gloves I can think of that don't have a seam there are the yoga gloves that I bought. They are black knit half-finger gloves with grippy things on the palms and fingers. They're very thin -- no padding at all.
Then there are the knit DeFeet full finger gloves that I have, which are a bit thicker but still unpadded. I have one pair in wool blend and one made from a synthetic fiber.
- 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