I have issues with plantar fasciitis so I need good arch support. I prefer new balance. I recently tried the teva mush, I had to order them online. They felt really comfy, but they ran too small. I'd need to Order up. Anyone else have that problem? I normally do a 7.5 and the 8 was too small. I fear a 9 will be too big. But they run small.
I too have plantar fasciitis. It sounds like you got the newer Teva Mush. Before developing PF, I used to swear by Teva Mush and carried several pairs down there every trip. That's about all I ever wore at WDW and my feet were happy. The old original Teva Mush always fit true to size. The newer ones run small and narrower. After developing plantar fasciitis though, I couldn't even wear my orignal Teva Mush and thought my flip flop days might be over. However, living in the south where flip flops are staples in our footwear and considering how much I love flip flops, I spent a fortune on a quest to find the perfect flip flop that would give my poor feet the support they need. I found it in the OluKai Ohana.

They are a little more expensive, but worth every penny. I also like the Cobian Leather Bounce, Sketcher Tone Ups, Fit Flops, Orthoheel Tides and Waves, Montrail Molokini, Flojos Exena, Yellow Box Jello, and Volatile Keralees. Nothing compares to my OluKai Ohanas though.

I also have a few pairs of the other OluKai (Kumu, Paniola, and Haiku Elua), but don't like them near as well as I do my beloved Ohanas though. I go to WDW several times a year and always wind up in the OluKai Ohanas.
Last trip I wore Teva Mush, Orthaheel and Chaco flip flops. All were very comfortable and I had no issues. Recently I purchased Spenco Yumi flip flops and I love them. They have the orthotic arch support and a metatarsal support. I plan to take these on my trip this year.
You might want to wear those Spenco Yumi for an all day shopping trip. I have two pairs of those and love them for around the house, but once wore my pink ones all day shopping. That little raised metatarsal support area made my feet very sore by that afternoon and by the time I got home late that evening I had a blister. I wear flip flops pretty much year around (with my plantar fasciitis, I never go barefoot even in the house), so my feet are very used to flip flops, but the metasarsal support in the Spenco Yumi do a number even on my feet by the end a day. Before developing plantar fasciitis I used to swear by Teva Mush or Ulani, Reef Ginger or Slap, Yellow Box, Grazie, Chaco, Sanuck Yoga Mats, North Face Base Camp Wedge, and Nike Celso.
I also love my montrail molokini recovery flips - they are fantastic for everyone asking about a flip flop having an arch. They are not cheap, but so well worth it. You actually bake them in the oven and mold them to your feet - my legs never feel tired in them.
Another fan here of the Montrail Molokini. Before finding my beloved Olukai Ohanas, they were another flip flop I highly recommended. I still love them and take them to WDW sometimes, but not as much as I love my OluKai Ohana's. I have over 200 pairs of flip flops and none compare to my beloved OluKai Ohanas. I swear they cured my plantar fasciitis and I will never be without several pairs. For my trip in two weeks, all we are taking are carryons. I plan on wearing a pair of gold (Mica) OluKai Ohanas on the plane and will pack a silver pair. I figure a gold and a silver pair will match everything I'll be wearing. Again I have many, many pairs of flip flops, but if I am going to be on my feet alot, always depend on the OluKai Ohanas. My elderly mom still loves her Montrail Molokini though. I bought her her first pair. When they came in, she tried them on and immediately fell in love. When I told her I was going to bake them for a few minutes, she nearly had a fit, even though she'd seen me bake several pairs of mine. lol She kept insisiting they were perfectly comfortable straight out of the box, but I told her they'd be even more comfortable after they were baked and she wore them for a few minutes, so they could conform perfectly to her feet. She fretted and threatened me the whole time they were in the oven that I better not ruin her shoes. lol Now when we get new pairs, she just hands them to me straight out of the box and tells me to bake them for her. lol