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.