"He wore the only English riding boots I had ever seen."

english riding boots
Public Domainenglish riding boots - Credit: acornsaddlery
Traditionally, English riding boots are made of smooth leather, usually cowhide or occasionally pigskin.

western boots
Public Domainwestern boots - Credit: wiki
English and Western riding boots have a distinct difference in design. English boots have lacing at the ankle, which allows a more comfortable ride. Western boots have riding ("cowboy") heels, while English boots have lower "walking heels".