I'd be upset too. Only getting 30 years use out of a pair of jet fins is practically unheard of.David K:I haven't had good luck with the old style Jet Fins (i.e. SP logo with out lightening bolt), in the last year I've worn out two fins, each one develop a sizeable crack in the side of the fin. I am currently diving with one good fin & one cracked fin, I'm going to try a new pair & see if they last a little longer.