Because there is a lot of walking on this tour, we highly recommend that you wear comfortable walking shoes. There is very little shade at the Roman Forum and Palatine Hill in particular, so we would recommend bringing a hat and sunscreen in summer and a rain-jacket or umbrella in winter.
As there are water fountains with (delicious) drinking water dotted throughout the Roman Forum & Palatine Hill, we would highly recommend bringing a bottle that you can refill.