Gore-Tex is a membrane made of PTFE (Teflon). The Teflon is stretched so that billions of small holes are formed. The new porous material is then called ePTFE (e for expanded). This creates about 1.3 billion pores per cm2, each with a diameter of about 1/20,000th of a drop of water, but about 770 times larger than water vapor molecules. This means that no water can penetrate, but the internal water vapor can escape to the outside. There are Gore-Tex in different laminates the standard consists…

Remove the inner cardboard roll. This allows the toilet paper to be easy rolled-out from the inside (like the carnival streamers) instead of unrolling the sheets from the outside.

Silnylon is often used as the main material for tents. That is a nylon layer, which is coated with silicone on both sides. The silicone increases the tear strength and makes the material water repellent or waterproof.