MbF Extreme outdoor blanket is 0gr lined and has a thick outer fabric of 1000den. Wide tail flap, belly surcingles, leg straps, tail strap loops, continuous slit across the back, anti-chafing lining, blind front closure. The 1000D nylon fabric is very non-porous and waterproof due to its polyurethane covering that allows the water to just roll off the surface without getting absorbed. It has a water-repellent finish and texture allowing it to be an indispensable companion in harsh, outdoor conditions. How Strong Is It? Denier fabric is an extremely strong fabric due to its polyurethane coating. Other factors such as the denseness of its weave and the considerable thickness and width of each individual fiber also add to the strength. This type of nylon has a history of use for military gear such as jackets, boots, and weapon holders as well as for ballistic jackets and gear. 1000D nylon can come coated and uncoated but both varieties are densely woven, super sturdy, and entirely tear-resistant. It is worth noting that 1000D nylon has up to 3 times the durability of the strongest polyester fabric.