Hazelburn was originally a lowland distillery and much has been made of the fact that Springbank distill Hazelburn in the traditional lowland style - (triple distilled and) using unpeated malt.
(I know that Auchentoshan also triple-distillation and Bladnoch not, but IÄm not sure what the others do).
If you Google you will find a few references to this, but here is one from Malt Maniacs which says it all:
(You will find Hazelburn in Entry 167 towards the bottom of the page (Approx 3/4 down).
This is what I meant in my reference to "Hazelburn style".