" The zip fins arrived yesterday -- pretty good, I'd say, considering they even threw a postal strike at you. The fins got tested today -- and they came through with flying colors.  There is much less effort than with other fins -- yet the propulsion is much stronger.  And afterward your ankles and legs tell you you've had a workout.  Best of all, with the fins off, my kick is immediately better.  The ankles are more flexible.  And this is the first day.  So, is the Zip Fin all it's cracked up to be?  Yes!  Thanks for the advice and the sharp service.  The book, by the way, is a little treasure.  I've dipped into it here and there and already come away with a few nuggets. All the best. " John, Italy