HUNTERDark Olive Women's Wellington Boots

I usually wear an 8 do they run true to size? Are they form fitting, that's what I am looking for?

How do I get a women’s 8.5... it’s saying that’s what hunter recommends for me?

I normally wear 7.5-8 (38-39 european) but I have very narrow/thin feet. What do you recommend?

These boots Are pretty expensive are they durable enough for sloshing through thick mud and clam digging in tide pools?