I received the flip flops on Thursday, tried them on, they were fine. On Friday afternoon, when I took them out of the car, the flip flops had shrunk significantly and their shape had changed! So, if I wore them in the sea, would they not be exposed to the sun? I have Crocs sandals since 2003, bought from a pharmacy. I have washed them in the washing machine at high temperatures countless times because I wore them in the hospital. For the past 3 months, they have been constantly exposed to the sun because I wear them in the garden and they haven't had any issues!!! For this reason, I doubt their origin and authenticity!