This is an interesting product. Bourbon, according to law, must contain at least 51% corn in it mashbill. (The mashbill, put simply, is the grain recipe used to produce the whiskey.) Many distillers use much higher portions of corn, and then toss in a little barley or rye.
This Tuthilltown Bourbon uses rye, wheat, and barley in addition to corn. And it seems to use them in pretty significant proportions, as this whiskey is not as sweet as Bourbon usually is. The rye adds a spiciness, and thee wheat and barley are less forward but present.
Although it is a solid 92 proof, it is very easy to sip neatly. Very impressive. (Rating ****1/2)