1) Like good air 
refers to the porosity of fabrics. Breathable materials are not waterproof.
• (a.) Such as can be breathed.
A material's ability to allow sweat vapors to escape from the inside of the fabric.See microporous.
Breath'a·ble (brē&thlig;'ȧ*b'l) adjective Such as can be breathed. 
Allows air to pass through
able or fit to be breathed: filters to make the air more breathable. · allowing the passage of air and moisture: a breathable fabric.
Blankets or other textiles that allow air to flow through them that lessen the chance of accidental suffocation.