Technical specifications:
Style: Shovel
Function: Breathable

Outsole: Flexible, PVC


Explanation for sizes:

Joan wears a 44 on a regular basis, in this case she wears a 48-49 flip-flop.
Marta usually wears a 39, in this case she wears a 42-43 flip-flop.

The easiest thing is to look at some shoes that you usually use, see the cm and compare them with the table that we have left you with the size/centimeters relationship.