Cushion Source Rounded Back Seat Cushion 19.5in x 20in - Deep 5in

In this review of the Cushion Source Rounded Back Seat Cushion the bottom line is straightforward: this is a well-made deep seat cushion for anyone who wants a durable, weather-ready pad that still reads as comfortable for prolonged sitting. The single biggest reason to buy is the combination of 5in CumuPlus fill and Sunbrella performance fabric, which delivers plush support without sacrificing colorfastness in outdoor settings. The reviewer found it especially suited to deep seating chairs, rockers, and lounge furniture where a tailored rounded back and box edge styling improve both fit and appearance.

Key Features

• Sunbrella performance fabric: Provides fade resistance and stands up to sun and moisture for use on patios, porches, or indoor sunrooms.
• 5in CumuPlus fill: Offers deep seating comfort with long-lasting support that softens slightly with use while retaining shape.
• Rounded back design: Curved back and box edge styling create a tailored look and fit for a range of chair widths and depths.
• Hidden zipper: Clean aesthetics and easy access for care or replacement without visible hardware disrupting the cushion lines.
• Proudly made in the USA: Quality construction and attention to detail from a brand with consistent craftsmanship since 2004.

Who It's For

The cushion is ideal for homeowners with deep seating outdoor furniture who want long-term color retention and a plush 5in profile for comfortable lounging. People who value a neat, tailored appearance will appreciate the rounded back and box edge styling that fits chairs roughly 19in to 21in wide and 20in to 22in deep.

Shoppers who need an ultra-soft, sinking seat may prefer a softer fill, since several users report a firmer initial feel. Also, those seeking a seat cushion for very narrow or unusually sized chairs should verify measurements before buying, as the design targets standard deep seating dimensions.

Pros & Cons

Pros

• Durable Sunbrella fabric keeps color and weathers well for outdoor use.
• Deep 5in CumuPlus fill provides lasting support ideal for rockers and lounge chairs.
• Rounded back and box edge give a tailored fit and improved aesthetics on many chair styles.
• Hidden zipper and American construction signal thoughtful design and build quality.

Cons

• Some customers find the cushion initially firmer than expected, which may not suit those seeking a very soft seat.
• The fit targets standard deep seating sizes, so unusual chair dimensions may require a different model.

Specifications

Product type	Rounded back seat cushion
Dimensions	19.5in x 20in x 5in deep
Fill	5in CumuPlus fill
Fabric	Sunbrella performance fabric (Antique Beige shown)
Design details	Curved back with box edge styling and hidden zipper
Use environment	Indoor and outdoor
Origin	Made in the USA

Our Verdict

The Cushion Source Rounded Back Seat Cushion is worth buying for anyone who needs a durable, attractive deep seat cushion that maintains color outdoors and delivers firm but comfortable support. It represents good value when matched to standard deep seating chairs, combining Sunbrella durability with American craftsmanship for an elevated, long-lasting patio or sunroom upgrade.

Frequently Asked Questions

Will this cushion hold up outdoors?
Yes. The Sunbrella performance fabric is fade resistant and designed for outdoor use, making it suitable for patios and porches.

What size chairs does it fit?
The rounded back cushion is tailored to fit chairs about 19in to 21in wide and 20in to 22in deep, ideal for most deep seating furniture.

Is the cushion soft or firm?
The 5in CumuPlus fill provides substantial support and a firmer initial feel that relaxes slightly with regular use.