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The breathability of a pair of pants tells you how much water vapor, or sweat, can exit the garment. The more a pair of pants can breathe the better it will be at keeping you a consistent temperature. Since the fabric is only letting out sweat, more breathable pants are not colder, just more comfortable in all conditions.

Pants with Very High Breathability (>20,001g) will keep you dry and comfortable in any conditions. These pants breathe so well, they will keep you dry even under a full day of heavy activity.

Pants with High Breathability (15,001-20,000g) are good for skiers and snowboarders who will work up a sweat from time to time. These pants provide great breathability which keeps you dry throughout the day.

Pants with Moderate Breathability (10,001-15,000g) are the most common, since they provide a good balance between function and the cost of technical fabrics. The pants in the moderate category can keep you dry and comfortable during a full day of moderate activity and will easily handle sustained periods of high activity.

Pants with Mild Breathability (5,001-10,000g) offer an adequate amount of breathability to remain comfortable for a full day of low to moderate activity and short periods of high activity. However, without careful layering you will become sweaty with high activity.

Pants with Low Breathability (<5,000g) offer some breathability but will keep sweat against your body under moderate to high activity, causing you to become cold when you stop moving.

Pants which are in the cateogry of Not Specified are made of materials that have not undergone breathability testing. This is common among casual pants.

Pants that are Not Breathable are specified by the manufacturer that they are not breathable, meaning that no water vapor will escape from the garment.

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