Breathability
Breathability of outdoor fabrics can refer to two different things: Air permeability, or the rate at which air flows through a fabricWater vapor permeability, or the rate at which water vapor flows through a fabric, also known as the moisture vapor transmission rate or MVTR Water vapor permeability is typically discussed in the context of waterproof-breathable (WPB) rain gear whereas air permeability is applied to most other types of gear, particularly wind shirts. Air permeability is measured as the volume of air that can pass through a fabric and a common choice of units is cubic feet per minute or [...]