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2. Hiking boot - Wikipedia

   en.wikipedia.org/wiki/Hiking_boot

   A Meindl boot with crampons attached. Upper: The upper part of a hiking boot is intended to protect and support the foot with an all-over snug fit. Uppers should be water repellent/proof, but allow the feet to breathe to prevent excess moisture from causing blisters and other discomfort.

3. Gore-Tex - Wikipedia

   en.wikipedia.org/wiki/Gore-Tex

   Gore-Tex is W. L. Gore & Associates's trade name for waterproof, breathable fabric membrane. It was invented in 1969. It was invented in 1969. Gore-Tex blocks liquid water while allowing water vapor to pass through and is designed to be a lightweight, waterproof fabric for all-weather use.

4. Durable water repellent - Wikipedia

   en.wikipedia.org/wiki/Durable_water_repellent

   Durable water repellents are commonly used in conjunction with waterproof breathable fabrics such as Gore-Tex to prevent the outer layer of fabric from becoming saturated with water. This saturation, called 'wetting out,' can reduce the garment's breathability (moisture transport through the breathable membrane) and let water through.

5. Breathability - Wikipedia

   en.wikipedia.org/wiki/Breathability

   Also known as JIS L 1099 is similar to the ASTM E96-BW test method. A desiccant, potassium acetate, is put into a cup and sealed with a piece of ePTFE (Teflon/Stedfast/Gore-Tex film). The fabric to be tested is then placed over the cup with the fabric side to the cup. The cup is then inverted into a pan of water.

6. Merrell (company) - Wikipedia

   en.wikipedia.org/wiki/Merrell_(company)

   Merrell is an American manufacturing company of footwear products. It was founded by Clark Matis, Randy Merrell, and John Schweizer in 1981 as a maker of high-performance hiking boots . Since 1997, the company has been a wholly owned subsidiary of Wolverine World Wide .

7. Sympatex - Wikipedia

   en.wikipedia.org/wiki/SympaTex

   Sympatex is a type of fabric that is branded as waterproof but "breathable", made or licensed by Sympatex Technologies GmbH a company founded in 1986. [ 2 ] [ 1 ] The fabric features a waterproof, windproof and breatheable membrane that is laminated to fabrics either on its inner surface or sandwiched between two fabric layers (often marketed ...