Terrible product Working great so far and have noticed there are about 10 people in my club have selected these shoes as well . Just received my phone bag - the bag fits my specialized comfort bike and my Apple 7plus. Once set up they are very stable. There is no weak part to the iems. There is no clue in the manual or on the product page as to what "MFB" stands for. Awesome little boat, good speed, simple and held up to my 4 yr old son for 2 trips to the park so far. The silver style, does not come with the leather straps that the red style does. I do a lot of recommendations for this brand of footwear. One fits slightly looser than the other (ironically it seems to be the opposite of the one of my feet that has always been slightly bigger than the other) but Im satisfied and will enjoy wearing them this summer.