With only 4mm of heel-toe drop and a low 15mm of stack height in the forefoot, the La Sportiva Helios 2.0 are the most minimalist of the low-profile shoes that we tested. They are far and away the lightest shoe in the review, while also offering without a doubt the most sensitivity and best trail feel. That said, these are such a lightweight shoe that we think most people will have problems running more than short distances in them, and we don’t believe they are well suited to highly rocky terrain, especially not on the downhill. We believe that the ideal application for this shoe is as an uphill only shoe, and think they are a perfect choice for such races as Vertical K’s or the Pikes Peak Ascent. While the Helios 2.0 have undergone some changes from the original version, it remains mostly the same in 2017 and is also available as the Helios SR, which is the same shoe with a sticky rubber outsole ideal for scrambling.