Become a 12th Man with these NFL® Seattle Seahawks™ Window Decals! The Seahawks' fans are famous for their boisterously loud support, and these decals are a quieter way of showing your fandom. With these decals on your vehicle windows or home windows, everyone will know where your loyalties lie. Vinyl. 4 decals on one 12" x 17 1/4" sheet. © NFL Properties LLC.