We’ve chosen fiberglass doors for the Sierra Series because they are low maintenance, energy efficient, and most importantly durable. They resist dents, scratches and are impervious to rot and rust. Fiberglass doors never bow or warp from exposure to weather. When properly installed, fiberglass doors offer superior security. Your entry door is only as secure as its frame, but composite door frames have twice the screw-holding power of wood. Our fiberglass doors come in different sizes and are made in the USA.