- A high-quality, durable sliding window made from Pella’s proprietary fiberglass material 
- NaturalSun Low-E glass allows the sun’s heat to flow in to warm your home and insulates from the cold 
- Backed by a national brand with one of the strongest warranties in the industry 
- Low-maintenance frame made of the strongest material for windows*, featuring an energy-efficient foam-filled sash and frame for added comfort *Pella’s proprietary fiberglass material has displayed superior strength over wood, vinyl, aluminum, 
- wood/plastic composites, and other fiberglass materials used by leading national brands in tensile and 3-point bend tests performed in accordance with ASTM D638 and D790 testing standards 
- The cam-action locking mechanism is a strong, zinc die-cast, for enhanced durability and resistant to water and corrosion 
- Interlocking meeting rail creates a barrier for air and water infiltration 
- For added strength, durability and reliable water performance, Pella Impervia products are secured with corner locks, metal fasteners and injected with sealant 
- Ready to install and completely assembled with a versatile nail fin design; slide in fin can remain on the unit for new construction applications or be removed for block frame replacement applications