<br><b>DuPont™ ThermaWrap® LE</b> is a non-woven, non-perforated, spun-bonded polyethylene sheet air and water-resistive barrier made with a metallized, low-emission (low-e) surface that reflects solar radiation away from the building. <br><br> In cold weather, this helps prevent radiant heat loss from within the structure. In warmer weather, <b>Tyvek® ThermaWrap® LE</b> turns the tables, reflecting warm air out and away from the structure, to help improve air-conditioning efficiency. In all seasons, that can help make both residential homes and commercial buildings more comfortable, more energy efficient, and less costly to operate. <br><br> Like all Tyvek® air and water-resistive barriers (WRB's), <b>Tyvek® ThermaWrap® LE</b> helps prevent water accumulation inside the wall system by allowing moisture vapor to escape to the outside. In turn, this helps reduce the risk of mold and wood rot, which is important in all climates. With its combination of air and water holdout, vapor permeability, and a low-e surface, <b>Tyvek® ThermaWrap® LE</b> provides the best of both worlds for managing energy efficiency.