The Nike ACG Pegasus Trail GTX packs more ReactX foam and a stronger version of Nike's All Terrain Compound outsole than the previous generation, built as a trail running shoe for wet, technical ground. The increased stack height adds energy return without sacrificing a stable, planted feel underfoot. A GORE-TEX membrane keeps water out through creek crossings and soggy trail sections, while the upgraded outsole compound holds an edge on slick roots and rock. What Our Gearhead(R) Experts Are Saying:"I ran through an ankle-deep creek crossing in these and never felt a drop reach my socks. The outsole held its line across a slab of wet granite right after, which is usually where I slow down to a crawl."