Mules are arguably the comfiest type of heel on the market, they don't pinch your heels and there's plenty of room for your toes so your feet don't suffer.
Typically they're less than four inches tall which means they're shorter than most heels too, giving you an added layer of comfort. One of the most desirable pairs to grab right now are those from fashion house Bottega Veneta.
The luxury fashion house has a number of different styles but the ones that stand out most to me have to be the raffia model. They come in a number of colours but my favourite are the pink which have a 9cm (3.5inch) heel and pretty viscose detailing. They typically cost £780 but I've found a dupe that isn't to be missed.