Johnnie Walker XR 21 Year Old is best described as an elegant, smooth, and complex blended Scotch whisky, offering a progression of rich flavors that balance sweetness, spice, and a subtle warmth. Its profile is often described as luxurious, mellow, and refined.

The whisky in this blend come from different regions to achieve its complex flavor profile. This includes a core of aged grain whisky from the now-silent Port Dundas distillery (Lowland region) and various single malts, including some from legendary Speyside distilleries. It has also been noted to include spirit from the highly sought-after, now-silent Brora distillery, located in the Highlands.