In terms of length, the flip flops were designed with a reasonably ‘snug / tight’ fit in mind. Before ordering we recommend you check out our size guide. Archies Flip Flop sizes fit slightly small, so if in doubt when choosing your size choose the size up.
The reason we encourage you to wear your Archies nice and snug is so the orthotic sits in the correct position under the foot.
It is important to note, that it is not a concern if some of the back edge of the heel hangs over the edge of the flip flop (as per the below image).
Of course, if your heel is completely over the edge of the heel cup and squashing down on the rim of the flip flop, then that is different, however, some heel overhang is ok. Again, the most important thing is that the flip flop is comfortable and the orthotic sits in the correct position on the foot.
For more information fitting in terms of length just click this link
To see the size guide to help you choose the perfect size just click this link