PrimaLoft is a patented ultra fine microfiber blend that is incredibly soft, lightweight and water repellent. PrimaLoft synthetic insulation absorbs three times less water, is 15% warmer when dry and is 24% warmer when wet that the closest competitive insulation. In addition to these impressive thermal properties, PrimaLoft is lightweight with a down-like softness that adds comfort and appeal and makes it highly packable.
The specially engineered WindStopper membrane not only provides full protection from the wind with a 0 CFM rating, it also stabilizes the microclimate close to the skin by allowing excess moisture to escape while preventing unwanted moisture from coming back in. Emphasis is placed on breathability.
Sitka waterproof breathable outer layers are originally treated with a Durable Water Repellant finish (DWR), which keeps the outer fabric from becoming saturated so that the breathable barrier can do its job. This coating needs to be replenished once per season, or more often if the piece gets a lot of use or washing. If water is no longer beading up on your shell, it's time to retreat it. Make sure to use a spray on our softshell pieces, and a wash-in for 2.5 layer garments, like the Downpour series. Additionally, don't hesitate to treat your Mountain Pants with a DWR spray and watch the water bead off.