Nissan 350Z 2003-2009 Convertible Soft Top & Heated Glass window Black Twill MATERIAL: A 45oz heavy weight two ply composite. Sounds impressive but what this really means for you is REDUCED NOISE! In comparative tests, It is 2 ply composite material with a heavy duty outer layer of PVC & a 100% Polyester laminated backing. Polyester is much stronger than cotton or poly/cotton blends when it comes to abrasion and tearing. Also polyester resists rot and mildew. Polyester is so superior in fact, it is the only material specified for use in all European luxury convertibles. LIFETIME WARRANTY-installation instructions available upon request with the purchase of the top DOT Approved Heated Glass Window This top comes completely assembled and ready to install. No sewing is required