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Made from high-density polyethylene fibers, Tyvek HomeWrap is an inexpensive weatherization membrane that resists air infiltration and water intrusion, yet is engineered to readily allow moisture vapor to diffuse through the material.
The fibrous structure is engineered with microscopic pores that readily allow moisture vapor to evaporate but are so small that bulk water and air cannot penetrate.
For the backpacker, Tyvek® provides a waterproof, windproof, breathable, durable, and extremely lightweight material. Tyvek® is puncture, tear, and abrasion resistant. It will not absorb water so it will be lightweight, even when wet - just give it a couple of shakes to get the water off and it's ready to pack.
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