Dolfin Swim Fins

I am 80 years old and have been swimming laps for a decade totaling 2.5 miles a week. I wear a women's size 5 shoe (35 EU) and found that the men's 3-5 fit me best. My favorite of the comparison of the Dolfin, Finis, Sporti and TYR is the Dolfin but Finis is a close second. I bought both. They fit comfortably, no blisters, move naturally in the water and are easy to take on and off. The Sporti had a boot measurement which I used because I thought it may be more accurate, but it put me in a Women's 6 which was way too big. Otherwise, I may have picked this as one of my favs. Use the shoe size on the Sporti not the boot length. I tried an XS and XXS on the TYR. One was too big and the other too small. The XXS fit better but was very difficult to get on and off. The TYR has a lot stiffer blade than the Dolfin, Finis and Sporti, so know that the TYR will give a lot more pull on your legs but provide more speed if your legs can take it.