Alder Folk boots are heavy armor boots in The Witcher 3: Wild Hunt that come in two forms:
Alder Folk boots (crafted)[]
Crafting Requirements 
Min. Required Level: Journeyman armorer
Alder Folk boots (relic)[]
Easily the best boots obtainable early in the game (with resistances unrivalled until mastercrafted witcher gear levels), at least one pair of these is guaranteed to drop by the bandits in the secondary quest Death By Fire.
They can also often be found as random loot at treasure locations and, starting at level 34, can be purchased from the following merchants: