There are a wide range of accessories that can be used for trail running, from backpacks to GPS watches, to caps and sunglasses. It is important whilst trail running to wear some technical socks. These will reduce rubbing and blister risk, whilst also providing some support to the foot and grip on the sole. A backpack or hydration vest is also a useful piece of equipment to use on the trails. A backpack can be used to store extra layers and also snacks in case you are out for longer than expected. A hydration vest is useful if you don't like to carry bottles, as they sit in pockets and are easily accessible whilst running. A GPS watch can not only track your pace and heart rate, but some of the more advanced models can be used to plot out a route and check your location whilst running. Hats can also be useful whilst trail running, either in hot or cold conditions. A Buff can be used to shield from the cold, UV rays and even insects!