Window Style Position Vests These Rugged Window Style Vests from DMS feature reflective bands, a large vinyl window on the back along with a pocket window on the front. Both front and back windows have a cover flap at the top protecting the position from the elements. All DMS inserted positions are printed on waterproof synthetic paper to ensure a long lifespan of usability. Order your window vest from our list of alternate positions, or, you may insert any alternate position you may need to complete your kit.(See Custom Vests below) We'll custom print your position on waterproof synthetic paper for you, or, order synthetic paper blanks and you can use a marker and create positions on the spot.