Burn Stewart Distillers is to launch its entire malt whisky range in un-chillfiltered form.
The move applies to the existing Bunnahabhain 12-year-old, Tobermory 10-year-old and Ledaig 10-year-old malts, and a new launch, Deanston Virgin Oak.
Master blender Ian MacMillan said: "Whisky spends all those years maturing in the casks, developing the aroma and flavour.
"By un-chillfilteing, nothing is taken away or added so whisky lovers can enjoy the whisky at its very best, giving them a better whisky experience."
All the whiskies are being bottled at 46.3% abv.
Deanston Virgin Oak has been finished in new oak casks from a cooperage in Kentucky.
The other three malts are being given a new look to coincide with the launch.