Ignore the bad reviews because they are unfounded.
They are light weight, no they are not those two dollar flip flops, but they are made of light materials.
They are not flat, They do have contour that shapes your foot.
I wear flip flops 9 months out of the year, from those at two dollars for around the pool, to the 125.00 dress flip flops. these are very comfortable every day casual flips.
One note: the picture is misleading... the yellow is more lime green... no yellow.
I'd buy these over and over again.