OLUKAINohea Mesh Men's Slip On Sneakers, Lightweight & Breathable All-Weather Shoes, Drop-in Heel & Comfort Fit

Are these shoes Vegan?

I cant find the lower price on olukai nohea blue?

Can these shoes be used as 'water shoes'?

I’m seeing different answers about shoe sizes. I wear size 12 mens is this size going to fit or should I have ordered a smaller size?!