Used at Tough Mudder Pittsburgh... Used North Face trail shoes prior... I thought those had traction!!! Almost unreal traction up wet slick clay. Dry after 1/4mile. GoreTex is useless in low trail shoes anyway. Paired with trail running socks found here on Amazon and felt like I could run several laps of the course! Only complaint is speed lace buckle packs with mud amd jammed. With sore calves it was frustrating not being able to loosen them up to remove!