| What it is | Pulling sweat off skin to evaporate |
| Benefit | Drier, warmer, more comfortable |
| Good wickers | Synthetics, merino wool |
| Avoid | Cotton (holds water) |
Wicking is a fabric’s ability to draw sweat away from the skin and spread it across the fabric’s surface, where it evaporates faster. This keeps you drier, warmer, and more comfortable during activity and is the defining job of a good base layer. Synthetics and merino wool wick well; cotton does not, which is why cotton is avoided in cold or strenuous conditions.
The base-layer job
It’s what a base layer does best — fabrics like merino wool, Capilene, and drirelease excel; cotton fails.
Frequently asked questions
What does moisture wicking mean?
Wicking is when a fabric pulls liquid sweat away from your skin and spreads it out over a larger surface area, so it evaporates more quickly. A wicking base layer keeps your skin drier during exertion, which improves comfort and reduces the chilling that happens when sweat sits against the body.
Why is wicking important outdoors?
Wet skin loses heat fast, so sweat trapped against you can chill you dangerously in cold conditions and feel clammy in any weather. Wicking fabrics move that moisture outward to evaporate, helping regulate temperature, prevent chafing, and keep you comfortable across a range of efforts and climates.
Why is cotton bad at wicking?
Cotton absorbs and holds water rather than moving it away, so it stays wet, loses its insulating ability, and chills you — the basis of the saying 'cotton kills' in cold conditions. Synthetics and merino wool, by contrast, wick moisture and keep insulating when damp, which is why they're preferred for active outdoor use.
Sources
- Moisture management — The Mountaineers
- Why not cotton — American Hiking Society