Our RG50/230 White Cushions are the highest density foam available ✅. With an extra firm feel, this severe-usage grade delivers unbeatable strength, long-lasting support, and maximum durability.
Perfect for firm sofa cushions, window seats, campervans, boats, and heavy-duty upholstery projects. Order through our Foam Cut to Size service for cushions made exactly to your measurements.
Not the right fit? Explore our full range of ready-made options here:⬅️ Standard Size Foam Cushions
£11.64 – £766.91
“Not sure which grade is right for you? Read our Understanding Foam Grades Guide for expert advice.”
At Foam4U, our RG50/230 White Cushions are the highest density foam we supply ✅. With an extra firm feel, this grade is engineered for severe and heavy-use applications, delivering uncompromising support and outstanding durability. Especially in cushions 4″ or thicker, it creates a super-firm seat base that stands the test of time.
Unlike standard foams that can soften, sag, or lose structure under pressure, RG50/230 offers exceptional resilience, ensuring your cushions remain firm, supportive, and hard-wearing for years to come. It’s the go-to choice when strength and durability are the top priorities.
✅ Super firm support – ideal for those who prefer a solid seat✅ Highest density grade – designed for severe everyday use✅ Exceptional resilience – resists sagging, flattening, and breakdown✅ Maximum durability – built to outperform lower-density foams✅ Excellent for thicker cushions – creates a stable, long-lasting base
🛋️ Firm Sofa & Armchair Cushions – heavy-use family furniture🌤️ Window Seats & Bay Cushions – strong support for wider bases🚐 Campervans & Caravans – dependable foam for travel and touring⛵ Boat & Marine Seating – robust enough for challenging conditions✂️ Bespoke Upholstery Projects – when only the firmest grade will do
20" x 22", 20" x 27", 22" x 27"
2", 3", 4", 5"
1, 5, 10, 25
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