The "turbo strap" seems to be an included feature of this series of Crocs - a most welcome addition. I wore my first pair out, and these are just the ticket to replace them. Narrower - hence more stable - and far less 'clunky' than the originals. My grandchildren jeer me less, people don't gawk and snicker; I am accepted for the forward thinking person I am. The leather uppers don't offend animal rights advocates; they probably think the stuff is fake. I'm pleased, and will most likely continue to buy these plastic marvels. cb