ClarksBREEZE SEA Women's Flip-Flop

I wear size 9.5 but they do not have that. Should I stick with 9 or go 10?

Can anybody tell if these flips run wide or narrow? I have very wide fat feet! Thank you in advance for your help!!!

I normally wear an 8.5. Would you suggest 8 or 9?

What is the difference between "new synthetic" and original? i have several of original breeze sea and need to replace some. why change a great sandal