Outsole: Synthetic and textile
After reading reviews, I sized up to a 9. I'm a US 8.5, and I usually order 8 in these types of flip-flops, but got a good fit sizing up. I'm a Rocket Dog flip-flop devotee; so I order a couple of pairs every summer. Have worn these several times, and they're comfortable, as RD's usually are. I can wear these all day at Six Flags without any issues -- except tan lines. If you're looking for black, comfortable flip flops, this is the brand for you! The soles mold to your feet and give you the exact support you need if you're on your feet a lot. I love these! I could not live without Rocket Dogs and Sanuk's They are always always always wonderful. A great buy for a great price- and a shoe that lasts- my God- if they last years on me- you could probably expect a normal person to have them for a lifetime! LOVE ! I've never owned rocket dogs before and that is all I will buy now! These are so comfortable! My feet didn't hurt even after wearing and walking around all day in them! I actually need a new pair now because my mother stole these from me! Haha!