Ghost of Tsushima: Swift Summer
Ghost of Tsushima's Swift Summer is a saddle for Jin's horse. It's a cosmetic upgrade and does not affect the performance of the horse. This a total of 8 collectible saddles in the game.
You collect them by exchanging Sashimono Banners to a Monk in Komatsu Forge.
Visit our Ghost of Tsushima 100% Walkthrough to get more details.