Merino wool is much finer than traditional wool and has tiny overlapping scales that case each fibre. these scales are hydrophobic- water repellent. Inside it's a different story, the fibre core is hydophilic- highly absorbent. Merino is therefore a wicking fibre and can absorb 10 times more moisture than synthetics. Each fibre can absorb up to one third of its own weight in moisture without feeling clammy or wet to touch. IN Sealskinz socks, the moisture is then wicked through the membrane to keep you feeling warm and dry. Merino wool has the ability to absorb and release moisture to cool or warm the feet, regulating temperature. It also has excellent anti-microbial properties helping reduce odour build-up inside your socks.