These shoes were recommended to me by your excellent customer support staff for the Tough Mudder event, and let me tell you, they were a HIT!!!!! These shoes stayed on tight for the whole 12 miles of thick mud and water and 26 military-style obstacles. Their ability to drain water and mud was phenomenal! I did not end up with one single blister! Their traction is so good, that when I scaled the 18-foot muddy, oiled wall, these shoes grabbed right on and I made it to the top in one long stride! My wife and I own 7 different Merrell shoes between us, and once again, these shoes performed as top-notched as expected!!!!