Sunbrella Buttercup Rounded Back Seat Cushion 19.5 x 20 x 5 in - Deep

In this review of the Cushion Source Rounded Back Seat Cushion in Sunbrella Buttercup, the bottom line is simple: this cushion is for anyone who wants a durable, fade-resistant deep-seat pad that still looks tailored. The reviewer found it especially useful for covered patios, porches and indoor sunrooms where bright color and weather resistance matter. The 5 in CumuPlus fill creates a noticeably plush, supportive sit while the rounded back and box edge styling give a custom fit for chairs around 19 in to 21 in wide and 20 in to 22 in deep.

Key Features

• Sunbrella Performance Fabric: Keeps the Buttercup color vibrant and resists fading and mildew for long-lasting outdoor use.
• 5 in CumuPlus Fill: Provides deep seating comfort with resilient support that holds shape over extended use.
• Rounded Back Design: Curved back and box edge styling create a tailored appearance that fits many deep seating chairs and rockers.
• Hidden Zipper: A discreet zipper maintains the cushion's clean lines and allows cover removal for cleaning or replacement.
• Indoor and Outdoor Use: Built to work equally well on patios, porches or sunrooms where both comfort and weather resistance are needed.
• Made in the USA: Manufactured with domestic craftsmanship and quality control since 2004.

Who It's For

This cushion suits homeowners and renters who want an attractive, durable seat pad for outdoor living spaces or bright indoor sunrooms. It is best for people who need a deep 5 in cushion for rockers, lounge chairs or deep seating chairs that measure roughly 19 in to 21 in wide and 20 in to 22 in deep.

It is not aimed at users seeking a slim, minimalist bench pad or those who need a custom-cut shape outside the rounded back profile. Also, if you require a waterproof core rather than performance outdoor fabric, consider a specialty waterproof design instead.

Pros & Cons

Pros

• Durable Sunbrella fabric maintains color and resists weather, keeping the cushion looking fresh outdoors.
• Thick 5 in CumuPlus fill offers plush, long-lasting support for deep seating furniture.
• Rounded back and box edge styling give a custom, tailored fit for many chair types.
• Hidden zipper keeps the look clean while allowing the cover to be removed for care.

Cons

• The cushion is designed for specific deep-seat dimensions and may not fit narrower or much wider chairs without checking measurements.
• Not described as fully waterproof; heavy standing water may still require additional protection.

Specifications

Product Type	Rounded back seat cushion
Dimensions	19.5 in x 20 in x 5 in
Fill	5 in CumuPlus fill
Fabric	Sunbrella performance fabric (Buttercup)
Design	Rounded back with box edge styling
Closure	Hidden zipper
Made	USA (since 2004)

Our Verdict

The Cushion Source Rounded Back seat cushion in Sunbrella Buttercup is a strong choice for anyone who needs a plush, fade-resistant deep-seat pad with a tailored look. It represents good value for outdoor or sunroom seating because the 5 in CumuPlus fill and Sunbrella fabric balance comfort and durability, though buyers should confirm chair dimensions before purchasing.

Frequently Asked Questions

Will this cushion fit a 20 in wide chair?
Yes; the rounded back design is intended to fit chairs about 19 in to 21 in wide and 20 in to 22 in deep.

Can the cover be removed for cleaning?
Yes; the hidden zipper allows the Sunbrella cover to be removed for cleaning or replacement.

Is the cushion suitable for year-round outdoor use?
Sunbrella fabric resists fading and mildew for outdoor use, but the cushion is not described as fully waterproof and may need storage or protection in extreme wet conditions.