breathable

Adjective

breathable (comparative more breathable, superlative most breathable)

1. suitable for breathing
   • The Wards are open-topped, with skyscrapers rising from the superstructure. Towers are sealed against vacuum, as the breathable atmosphere envelope is only maintained to a height of about seven meters. The atmosphere is contained by the centrifugal force of rotation and a "membrane" of dense...2008, BioWare, Mass Effect (Science Fiction), Redwood City: Electronic Arts, →ISBN, →OCLC, PC, scene: Citadel Station: Wards Codex entry

   Antonyms:

   unbreathable

2. (usually) Letting air seep through.
   • breathable paint
   • If you’re looking for the most breathable mask, Lukovics says, “Cotton is preferable, mainly for absorbing moisture/sweat.” She says multiple layers may be more protective but will also impact breathability.2021 August 17, Elizabeth Wallace and Kai Burkhardt, “12 breathable face masks to protect you while exercising”, in CNN