Join Heidi and the snake chain gang. We've seen actual snakes on jewelry for a while now, but let's regress. The flat and slithery chain is possibly the sexiest chain out there. It's ideal for knot and layered designs because of its flat texture. The Martin Grant necklace Heidi wore to a McDonald's promotional event in Munich was pretty heavy duty, but that's how she rolls. Fit for Medusa, be my guest, mess with the snake chain gang.