Winter's Arc Short Bow Skin
From Guild Wars 2 Wiki
“Double-click to consume.
Seasonal. For sale only during the Wintersday season. Use anytime to upgrade the appearance of a short bow. Usable only by short bow wielders.
— In-game description
All Wintersday wooden weapons have a wintery snowflake glow as well as a pulsing white branch design. The shortbow's branch design runs up and down the bow's body. A picture of the shortbow's glow can be seen here or here.