LitfunWomen's Fuzzy Memory Foam Slippers Fluffy Winter House Shoes Indoor and Outdoor

Hi i typically wear about 6.5, but my feet are sort of narrow so typically i wear shoes in either 6.5 or 7. should i get size 7-7.5 so they’ll fit?

what if i am a 8.5/9 size? what size would be best?

If I wear a 10 should I size up or get the 9-10 size?

Are these slippers vegan (with no real suede or leather)?