DuPont Tyvek Silver Breathable Waterproof Heat Reflective Sheet (New, Unused) Compared to standard Tyvek, this has higher breathability, waterproofness, and heat reflection performance. Sold by the cut. Will be folded and shipped directly in an A4 envelope. Since it will be shipped folded, there will be wrinkles and creases. No price reduction. Thank you. Non-woven fabric Material Filter Tyvek sheet Tyvek Waterproof sheet Siding underlayment Tent Ground sheet Outdoor Camping DIY ALTRA