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i went by customers' sizing suggestions, but the1st pair i ordered were WAY too small. so we did an exchange. i asked for the biggest pair they made this time (2 sizes up from what i ordered the 1st time). and my replacement pair were THE EXACT SAME SIZE AS THE 1ST PAIR. grrr. luckily my nephew loved them (they ARE good quality if u can get a pair that fits), and it's his birthday, so he has them now. i'll keep looking for myself elsewhere.
I felt pretty satisfy when just tried it on without actually used it. Now, I can tell you it's a very good fin after my Mexico trip. It makes me swim like a fish, very fast, not heavy, easy to move from here to there. Highly recommended this product.