WoWDB

This item is attached to a letter sent by Great-father (or Greatfather if you're Alliance) Winter approximately 24 hours after completing "A Smokywood Pastures' Thank You."

From: Great-father Winter
Subject: (no subject)

Ho ho hello again, <player>!

Though I and the good folks of Smokywood Pastures have been quite busy this season, I just wanted to send you something special along to you. You'll be happy to know what[sic] Sacks out in the Alterac Mountains; he sends his best.

In freeing Sacks, we managed to develop a novelty device that I think you might enjoy. You will need a snowball to power it, but I think you'll enjoy it quite a bit!

Great-father Winter

The Winter Veil Disguise Kit is mailed to your character upon completing the quest series that starts with You're a Mean One... (A)/(H). The item is unique, so if you have the kit from a previous year then you will be unable to loot the kit from your mailbox.

The item is required for completing  A Frosty Shake.