Excalibur White and Excalibur Brown is an 8 mil (200 micron) poly that blocks light from entering greenhouse structures thus giving a cooling effect to the covered area. It is ideal to use these products to cover areas like warehousing, fertilizer and water storage tank rooms, product packing and shipping-receiving. Excalibur White and Excalibur Brown offers excellent strength, maximum shading and an A/C property like no other . Life Expectancy: 4 years Visibility: None Thickness: 8mil (200 microns)