Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
This is, in my opinion the perfect build for ashe as a mid champion, whilst playing mid as ashe, try your best to keep your eye on other lanes and offer to shoot up and arrow to get a kill or force a recall, especially as soon as you hit level 6 as it proves very helpful. Clarity helps ashe stay in lane for very long periods and forces opponents back with volley spamming. It is obviously very difficult to get all of the items which I have chosen unless the game goes to late game, but if you are not going to get all the items - work up to them the best you can, try your best to gain as much gold from last hitting minions as much as possible and your money will get you all the items you wish, you want to at least double the amount of minion kills you have compares to your opponent at mid, and should easily be top of your team.