Infinity from Marvin® is a line of Ultrex® fiberglass replacement windows and patio doors designed by the experts at Marvin Windows and Doors. Infinity products are designed to replicate the look of traditional wood windows and doors while providing modern features and low-maintenance performance. Infinity’s tough, energy-efficient windows and doors are customizable to meet the needs of any replacement project. All Infinity products are sold by local window replacement experts as a complete, installed package to provide you with a high-quality and hassle-free experience.