These are excellent shoes. I use them on grass, gravel, and sand/dirt surfaces. They're light and provide solid grip on all surfaces.

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4/28/18: I'm revising my review to 2 stars for the poor durability of these shoes. I've worn them less than a hundred times, and when I do where them they get relatively mild use. However, one shoe has developed a tear near the front where the fabric meets the rubber above the toe area and the other shoe appears close to developing a similar tear. I also had a prior pair of Inov-8s and both of those shoes also developed tears (in that case it was where the fabric upper was connected to the sole).