Frye Engineer 12R in Black. - size 10 (also in ) Frye Engineer 12R in Black. - size 10 (also in ) Leather upper with rubber sole. 1.5 heel. Shaft measures approx 8.5 in length. Buckle accents. FRYE-WZ286. 77400. The oldest continuously operating shoe company in the US hasn't missed a beat with its commitment to classic American styling. Fashion's temperamental tastes may come and fade away but we know where to go for an unfussy, wearable, workable boot. Now bring on this season's skinny jeans.