What does breathability mean?
Breathability is a noun describing how readily a material allows air and moisture vapour to pass through it. The term dominates the language of textiles and outdoor gear: a breathable rain shell or running shirt keeps the wearer dry by letting perspiration vapour escape rather than trapping it against the skin. Beyond clothing, the word appears in building science, where the breathability of walls and insulation affects how moisture moves through a structure. Because breathability is usually measured or rated — often alongside waterproofness — it carries a technical, evaluative flavour, and in advertising contexts it functions as a byword for comfort. The word derives from 'breathe' plus the suffix '-ability', marking it as a quality that can be possessed in greater or lesser degree. It is always uncountable: one speaks of a fabric's breathability, not its 'breathabilities'. For anyone shopping for performance apparel or discussing ventilation and moisture management, breathability is the precise, widely understood term of choice.
The degree to which a fabric or material allows air and moisture vapour to pass through it.
"This sleeping bag's breathability prevents that clammy feeling on humid nights."
Uncountable; typically discussed in terms of high or low breathability rather than exact quantities outside technical specifications.
More generally, the property of permitting the free passage of air, applied to structures, systems, or environments.
"Good soil breathability encourages healthy root development."
A less common, extended sense found mainly in technical and scientific writing.
Rarely used; the noun is almost always treated as uncountable, so the plural appears only in highly technical contexts comparing distinct types or measures of breathability.
"Different membrane technologies offer different breathabilities across a range of conditions."
That 'breathable' jacket you own doesn't actually breathe — it sweats for you, letting your moisture vapour escape while keeping rain out.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of breathability
Breathability is formed within English from the verb 'breathe', which descends from Middle English 'brethen', itself derived from the noun 'breath', ultimately tracing back to Old English 'brǣþ' meaning odour, exhalation, or vapour. The adjective 'breathable' emerged first, and 'breathability' was formed from it with the suffix '-ability' (from Latin '-abilitas'). The word rose to prominence in the twentieth century alongside synthetic fabrics such as Gore-Tex, which made 'breathability' a key selling point in technical outdoor wear.
How breathability is actually used
Breathability is an uncountable noun used almost exclusively in technical and commercial contexts — outdoor apparel, sportswear, textiles, building science. It is rarely heard outside these domains and carries a neutral, evaluative connotation: high breathability is almost always presented as desirable.
Easily confused with breathability
'Breatheability' is simply a nonstandard variant spelling; 'breathability' is the accepted form.