Collegiate Web Core Stirrup Leathers Brown. Collegiate have searched far and wide to bring you the best quality European leather they could find. Paired with stainless steel fittings, the Collegiate Web Core stirrup leathers are built to last. Featuring a web core, the Collegiate Web Core Stirrup Leathers are engineered to prevent stretching. Perfect to replace old/used stirrup leathers, a tackroom must-have.