Wicking
Also searched as: moisture wicking, capillary wicking, wicking rate, vertical wicking, moisture management, liquid moisture transport, one-way transport, directional water transport
Wicking is the spontaneous transport of liquid through or along a textile by capillary action in the spaces between fibers and yarns.
In detail
Liquid is drawn into narrow gaps when it wets the fiber surfaces, because surface tension pulls the liquid front forward against viscous resistance. In a fabric, those capillaries are the channels between fibers inside yarns and between yarns. Wicking spreads sweat over a larger area where it can evaporate, which is the basis of moisture-management claims. Fiber surface chemistry, cross-section, yarn structure and fabric construction all influence it, and absorbent fibers behave differently from hydrophobic ones.
The science and numbers
Capillary pressure scales with liquid surface tension and the cosine of the contact angle divided by pore radius, so good wetting and fine, well-connected pores drive flow; viscous drag grows as pores narrow. Classical Lucas-Washburn analysis predicts that early wicking distance increases roughly with the square root of time, slowing as gravity or supply limits intervene. Tests include vertical strip wicking with an unlimited reservoir, horizontal or droplet spreading with limited liquid, and moisture management testers measuring one-way transport between faces. Research shows these conditions can rank the same fabrics differently. Engineered structures, such as Janus fabrics with wettability gradients or conical micropores, drive directional transport from skin side to outer face, and reviews now link wicking with evaporation and heat transfer in personal thermal management.
A practical example
Hang strips of cotton jersey and polyester jersey with their ends in colored water and mark the liquid height every minute. The polyester strip may rise faster, yet when a single drop is placed on each fabric the outcome can differ. One study found that a hydrophobic profiled polyester led in the vertical test, while a hydrophilic-hydrophobic combination yarn spread liquid better under limited droplet supply.
What to distinguish
Wicking is not absorption, drying rate or comfort by itself. A fabric can wick quickly yet hold water, or absorb much yet spread slowly. Results depend strongly on test conditions such as liquid supply, direction and time, so compare values only from the same method. Hydrophilic finishes that create wicking on synthetics can wash out.
Origins and history
The word borrows the image of a lamp or candle wick drawing fuel upward by capillarity. As synthetic fibers entered sportswear, manufacturers used profiled cross-sections and hydrophilic finishes to promote wicking, and the term moved from physics into marketing. Current research has moved beyond simple wicking and drying toward directional sweat transport and responsive moisture regulation.
Related terms
Sources & further reading
- Polymers: Liquid transport on twisted profile filament/spun combination yarn in knitted fabric (Cui et al., 2025)
- Advanced Materials: Personal moisture management by advanced textiles and intelligent wearables (Shou and Li, 2025)
- Advanced Materials: Bioinspired Janus textile with conical micropores for moisture and thermal management (Dai et al., 2019)
- Heliyon: Fiber types and fabric structures influence on weft knitted fabrics (Hoque et al., 2022)
Technical references reviewed 2026-09-22. Examples are illustrative. Industry organizations and manufacturers describe their own fields; their references are not independent product endorsements. Figures are approximate and depend on the stated test conditions.