breathable

1. (of air) suitable for breathingExamples: "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, colorless sulphur hexafluoride gas, held in place by carefully managed mass effect fields."Antonyms: unbreathable

2. (of a fabric, etc.) Letting air seep through.Examples: "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."usually