From a secret Islay distillery, this has full-bodied layers of peat and smoke and bottled at a sturdy 56.9% cask strength.

From CLASSIC OF ISLAY -THE WHISKY EXCHANGE

I love LAGAVULIN. And I had no cahnce to try its cask strength. But this time I could drink this LAGAVULIN CASK STRENGTH! In my opinion, as this is cask-strength, its taste contains much more stronger peat aroma compared with official LAGAVULIN 16 YRS [43%]. And this is more sweeter. If you like LAGAVULIN, you may be satisfied with "CLASSIC OF ISLAY", too.