The sl is lighter weight, not quite as padded as the regular ariel. I have the sl on my mountain bike. The regular ariel on my commuter. I can ride my commuter without bike shorts and have for 15 miles without any bottom problems. I haven't tried mountain biking without bike shorts, I think.
I don't remember if the SL has titanium rails and the other one doesn't... They're both very comfortable saddles. Riding on the ariel once was enough to convince my bf that he actually needed to buy a saddle instead of using whatever came stock on his bikes.





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