Durafit Seat Covers, SN6-X7, 1998-2003 Toyota Sienna, 7 Passenger Van Complete 3 Row Set, (Without Side Impact Airbags), Exact Fit Car Minivan Car Seat Covers, in Gray Twill Fabric 1998-2003 Toyota Sienna 7 Passenger Van Complete Set Exact Fit Seat Covers Front Captain Chairs Without Side Impact Airbags In Seats Middle Captain Chairs With Two Armrests Per Seat Rear 50/50 Split With Adjustable Headrests Color:Gray. Fabric: Twill, which is a durable flat woven material often used by auto manufacturers. A polyester based fabric, twill is very strong and is Teflon and UV treated to withstand stains and fading. We use US made automotive grade twill which is designed for use in vehicles.