I was worried about the wide foot thing when i first started looking at them too. I wear a size 10-11 depending on the shoes and also have a wide foot. i had NO trouble wearing them and have often worn them with socks. I only have the beach ones though (i am not quite gauche enough to wear those nile ones with socks! :rofling: ) and i have three pairs.
I don’t know what they are made of but the material is more spongy than plastic would be…i have never had a sweaty feet issue and i am usually throwing off furnace style heat! I love love love them and will wear them whenever i can get by with it.
oooh if i ever have had moments with them not seeming wide enough it was when i was wearing socks AND the strap was back. most of the time i wear the strap forward just cuz it is quicker to slip on.