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Coolmax is the brand name for a series of polyester fabrics developed and marketed by Invista (formerly Dupont Textiles and Interiors). Coolmax is marketed as "moisture-wicking" and "breathable". As a polyester, it is moderately hydrophobic, so it absorbs little fluid and dries relatively quickly (compared to absorbent fibers such as cotton). The cross-section is non-round, increasing surface area by an estimated 20% (over round fibers) in order to produce a wicking effect via capillary action.