On my road bike I've always preferred microtex type fake leather bartape. When I started riding at the track I found I wanted something with a bit more grip but similarly thin and not cushy so I tried lizard skins 1.8mm bar tape. I really liked it but with recent switch to the Look sprint bars on my bike I found the diameter of the bar a bit big. I was looking into even thinner tape options when I discovered that lizard skins does a 0.5mm version of their tape... but not for bicycles, for baseball bats!
I figured I'd try it out and ordered 4 rolls online. Turns out each roll covers about as much handlebar as a track grip would. First impressions are good, feels just as good as the 1.8mm tape but with even less give. Only downside is that they come with angled cuts on the end of the rolls that require to wrap both sides the same way unless you want to sacrifice a few inches of tape.
Figured I'd mention it for anyone else looking for something like that.