Infinity from Marvin Fiberglass Replacement Windows & Doors – Attractive, durable, and low-maintenance, Infinity fiberglass replacement windows and doors are made completely of Ultrex – a pultruded fiberglass material.
- Strength – 8x’s stronger than vinyl; 3.5x’s stronger than wood/vinyl composites; 3x’s stronger than wood
- Low Maintenance – no sanding, scraping, or refinishing over time
- No Finishing Required – Ultrex on the interior and exterior
- Durability – won’t rot, warp, corrode, crack, dent, chalk, or fade
- Stability – minimal expansion/contraction is virtually the same as glass for tightly sealed units with consistently easy operation – won’t bend, buckle, twist, or warp in extreme conditions

Energy Efficient & Environmentally Friendly!
- Ultrex fiberglass is made partially from recycled materials
- The glass in Infinity products contains 15-33% recycled content
- Ultrex requires 39% less energy to produce than vinyl and 80% less to produce than aluminum
- The main ingredient used to make Ultrex fiberglass is glass, which is made from silica sand, an abundant natural resource
Replacement Window Choices

Casement Window

Double Hung Window

Casement Window

Double Hung Window

Casement Window

Double Hung Window
Exterior colors available in the following options:

Interior finishes available in the following options:
We have 30 different stains to match your existing interior woodwork!
Available in the following options: