First Quality Haartz Stayfast Canvas Precision cutting with automated computer guided equipment Stitched with matching colors using the finest bonded polyester threads DOT approved Glass Window with embedded defroster wiring Heat-sealed seams for added strength and durability This Neutral Stayfast Miata Top is full of features. It's a 2 piece factory style with glass window. The window does not zip open, but it has the factory original style deck seams and overlapping quarter panels too. The pre-punched plastic retainers make it easy to install. And, last, but certainly not least, it has the upgraded Haartz Stayfast cloth that is much quieter and more durable than vinyl.