Blazing Tufts are crafting materials that are dropped by Fenris and are used to craft Armor of the Wolf. They are base fire materials.
In order to get the 50 materials needed to craft the armor you need to defeat the boss up to tier #15. In order to gain the additional 50 materials needed to craft the plus version of the armor you need to defeat the boss up to tier #43. You can create a 3rd armor after beating tier #60.
This can also be obtained by summoning Fenris at summoning stone for 11 gems during the event, or 30 gems afterwards. Remember these are limited but can still be a achived only by fighting Fenris.