The phrase "muddy trails" refers to paths or roads that are covered with wet dirt or clay, making them unclean and challenging to walk or drive on. Full definition
Shoes with a reasonably aggressive tread pattern for traction on muddy trails. (caradonna.com)
It's a shame, because there's a lot to like about this beast that isn't so much about splashing through muddy trails off - road like its big brother the Raptor, but instead is all about hitting the street like some hot little hatch. (bestride.com)