I love using my fins for part of my workout, but am getting increasingly frustrated with finding a fin that lasts for more than 2 months. Not sure if I can say what brands I've tried, but, I'm looking for a fin that is not really heavy (causing cramps in feet and calves), that is not too short and not real long. Hopefully, a fin with these simple dimensions will last for more than a month or two. Thanks for any input.