Introduced in 2019 via the 'Shattered Web' collection, Runoff became available through case drops and trading. It features a gritty, industrial aesthetic.

The skin showcases a rusted, worn metal look with dark brown and gray tones, resembling a weathered, abandoned firearm. The primary colors are rust, gray, and black.

Runoff is appreciated for its rugged, realistic appearance, making it favored among players who prefer gritty designs. It has a niche but steady demand.