You should try out several different brands and types of fins to see what works best for your feet. My local dive shop will let you try out gear before you buy it. Now, you may not be able to swim around their pool enough to know whether they will actually give you blisters after a full day of diving, but at least you will know whether they are uncomfortable on your feet after a few minutes in the water. For me personally, I always get blisters with the full foot fins, so I have converted to wearing neoprene booties and adjustable strap fins. Since I have converted, I have not gotten any blisters on my feet.