Ghost of Tsushima: Snow Demon's Eyes

Ghost of Tsushima's Snow Demon's Eyes is a sword kit with the description "Even in blinding snow, the demon sees all" It is one of the appearance upgrades for the Sakai Katana that you can buy from merchants.

Even in blinding snow, the demon sees all.

Acquiring Snow Demon's Eyes

You can buy it from merchants at the cost of 15 flowers.

Merchants sell not only sword kits, but also bow kits, armor dyes, and hats. 

Visit our Ghost of Tsushima 100% Walkthrough to get more details.