I dislike memory foam because it flattens out and the once soft slipper becomes hard. Súper producto :) I came from an iPhone XR and I have to say, this is much better in my opinion. Clear sound for music, audiobooks and phone calls. Cheap don?t buy chesoBrittke plastic The battery also does not last as long for me. All I had to do was leave a positive review. The flip flops are beautiful. Contras:1)Como soy gordo sudo mucho. Am SOLD!