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Home
Products
Windows
Specialty Shape
Essential Specialty Shape Window

Essential Specialty Shape Window

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The Marvin Essential® Specialty Shape windows, made of Ultrex® fiberglass, offer eight unique shape options. Specialty shape windows are often used as sidelights and transoms, or combined to create a wall of fixed windows.

Material
Ultrex Fiberglass Exterior and Interior
Interior Color
4 Color Options
Exterior Color
6 Color Options

Essential Specialty Shape Window

Why You'll Love It

Superior Durability

Made with Ultrex fiberglass, which is 8x stronger than vinyl.

Virtually Maintenance Free

Resists fading, bends, dents, and cracks.

Unique Shape Options

Shapes include rectangles, triangles, pentagons, octagons, and round top.

Streamlined Appearance

Low-profile with contemporary styles.

Interior product rendering of Marvin Essential Polygon Window at an angle
Interior product rendering of Marvin Essential Polygon Window
Exterior product rendering of Marvin Essential Polygon Window at an angle
Exterior product rendering of Marvin Essential Polygon Window
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Interior product rendering of Marvin Essential Polygon Window at an angle
Interior product rendering of Marvin Essential Polygon Window
Exterior product rendering of Marvin Essential Polygon Window at an angle
Exterior product rendering of Marvin Essential Polygon Window

Essential Specialty Shape Window

Select Shape
Details + Features
Details + Features

Sizing

Available in sizes up to 49 square feet. Longest leg may not exceed 9'-5"

Material

Ultrex Fiberglass Interior and Exterior

Standard Performance Ratings

Up to PG50 for air, water, and structural integrity

Energy Efficiency

Options to meet ENERGY STAR® throughout the United States

Specifications/Catalogs

Get Essential product resources here, including manuals, specifications, warranty information, and catalog.

Architectural Detail Manuals
Essential Direct Glaze Polygon - Architectural Detail Manual (ADM)
Construction Specs
Essential Direct Glaze Polygon - Construction Specification (CSI Spec)
Essential Collection Catalog
Marvin Limited Warranty
View All Tech Specs

Ultrex Fiberglass

Marvin Essential products feature Ultrex fiberglass for superior durability and energy efficiency.

Holds shape up to 285°F

AAMA 624 verification

8x stronger than vinyl

Virtually maintenance free

Specialty Features


Superior Durability

Made with Ultrex fiberglass, which offers superior strength and durability over vinyl and wood/vinyl composites.

Premium Finish

Acrylic finish is 3x thicker than competitive painted options​ and resists scratches, chipping, peeling, chalking, and fading, even in dark colors​.

Thermal Performance

Low thermal conductivity rate of Ultrex fiberglass, combined with energy-efficient glass, including dual- and triple-pane glass options on windows.

Design Options
Design Options
Colors

Exterior Finishes

Choose from a range of rich, neutral color options.

Interior Finishes

A curated selection of interior color options that coordinate with exterior finishes.

Glass

A variety of decorative glass options are available. Glass is available in dual-pane in Low E1, Low E2, Low E2/ERS, Low E3, and Low E3/ERS insulated glass with argon gas. Options include glazing for sound abatement (STC/OITC), high altitudes, and California fire zones.

Design Files
Design Files

2D Elevations

2D Operating Details

3D

Installation Information
Installation Information

Essential windows are built for quick, easy installation.

Guides

Installation Guide
All Installation Guides

Nailing Fin

Pre-attached folding nailing fin and drip cap for easier installation.

Through Jamb

Available through jamb and installation bracket options.

Factory-Applied Jamb Extensions

Factory-applied jamb extensions save time and labor. We supply 4-⁹⁄₁₆", 6-⁹⁄₁₆", and 6-¹³⁄₁₆" jamb depth in bare wood, white, designer black, or clear interior finish.

Factory-Mulled Assemblies Available

Standard factory mulling, reinforced factory mulling, or field mulling kits.

Corner Keys

Integral corner keys keeps window and door units square and corners sealed.

Custom Sizes

Custom sizes are available on windows and doors in ¹⁄₆₄" increments for the perfect fit every time.

Paintable Ultrex Exterior

The Ultrex fiberglass exterior is paintable, and it holds dark colors better than vinyl or vinyl/wood composites.

Service + Replacement Parts
Service + Replacement Parts

Find information on Essential product service, care, and replacement parts.

Manuals

Parts Manual
Owners Manual

Helpful Links

Warranty
Care + Cleaning
Product Registration
Request Service
Get Replacement Parts

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Need project assistance? Answer a few questions to help us connect you to the right person.

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© 2026 Marvin

Company
CareersOur StoryIn The NewsInfinity By MarvinInfinity ReplacementTruStile
Support & Resources
Support CenterFor ProfessionalsTechnical SpecificationsEnergy DataProduct LiteratureGlossary of TermsWarranties
Where to Buy
Find a DealerInternational DealersReplacement Solutions
Email Sign Up
Privacy StatementTerms of UseCalifornia Users/Privacy

© 2026 Marvin