I was a long-term user of Dunlop's Stubby 1mm picks but I always found them a bit small and they were not exactly flexible. Then I came across these - smaller than regular picks but bigger than Stubbies.
So I ordered a pack to sample them and to my great surprise, they do work as advertised - it's YOU who controls how firm the pick is. The size is just right and the grip excellent - it's rubber and plastic. Oh, and you CAN use the rubber for picking :)
I could go on waxing lyrical about these but there's no need.
Oh, I don't do jazz, I play mostly metal :)