custom cut foam trapezoid

A custom cut foam trapezoid is the easiest way to fill a seat with angled sides, such as a bay window bench, a boat bow, an RV dinette, or a corner banquette. A standard rectangle leaves gaps at those angled ends. Foam cut to your exact shape fits edge to edge, so the finished cushion looks tailored and stays in place.

Where Trapezoid Foam Works Best

Use trapezoid foam anywhere one long edge is wider than the other:

• Bay window seats with angled end panels
• Boat and marine benches that follow the hull
• Corner nooks and built-in dining benches
• Outdoor and patio seating with tapered frames

What to Look For

Measure Carefully

Record the long base, the short base, and the depth between them. Then check the side angles, since a trapezoid can taper evenly on both sides or on only one.

Choose the Right Foam Type

Firmer, higher-density foam keeps its shape on seats that get daily use. Softer foam is better for back cushions. For outdoor or marine spots, pick a quick-drying foam that resists moisture.

Ready to build a seat that fits? Browse the trapezoid foam options below and find the right match for your project.