Bontrager Affinity RXL Saddle (for Road or MTB)
I have this seat on my Trek Madone 6.9 SSL as well as all my mountain bikes, because it’s light, reasonably priced, and never causes me discomfort, even after 8+ hours in the saddle.
See pricing at Amazon @AMAZON.
See also the superlight Selle Italia saddle.
Weight
I find that the RXL model is quite comfortable for me. Iuse the medium width model.
Affinity RXL: 203g - 207g
Affinity RL: 247g (more padding)