You can then select thickness from 1" all the way up to 6" thickness.
eBay
Foot Cushion Donut Foam Pillows Anti-Bedsore Knee Ankle Protector Hand Support Pillow For Elderly Household Resting
Aliexpress UK
Foam cut to size: Seating cushions in various sizes and thicknesses in firm/high grade of quality foam, please use the drop down menus to choose. High density quality seating grade foam manufactured in the UK, suitable for many applications including quality sofa and upholstery seat cushions, boats, caravan bunks/seats, dining chairs and camper vans. CAUTION: Please do not confuse this blue firm high density quality foam with inferior green foams that others sell and claim to be "firm". All high density firm foams are blue, not green! All prices include VAT and Free delivery. We can cut foam to any other size and shape, please contact us on ebay.
eBay
Foot Cushion Donut Foam Pillows Anti-Bedsore Knee Ankle Protector Hand Foot Support Pillow For Elderly Household Resting
Aliexpress UK
Density: High Density (All Firmness Levels). High Density: Outstanding durability and comfort for seating, cushions, crafts, and more. Type: Foam Sheet / Cushion Foam / Upholstery Foam. Material: Upholstery Foam.
eBay
Sleep Pillows Egg Sleeper Memory Foam Soft Orthopedic Neck Pillow Almighty Microsphere Foam Soft Butterfly Shaped Foam Cushion
Aliexpress UK
Built to Endure, Crafted to Last: For over 60 years, we've been the trusted supplier of high-performance upholstery foam to the trade. This 1.8 lb density foam provides unparalleled support and comfort, while fire-retardant properties ensure safety.
eBay
Home Chair Cushion Memory Foam Buttock Pillow Office BBL Recovery Pillow After Surgery Seat Brazilian Butt Lift Pad Hips Support
Aliexpress UK
If you're seeking higher quality or more durable options for high-density upholstery foam, particularly for applications like seating pads, caravan cushions, bar seating, and custom projects, focusing on premium materials and suppliers is key.
eBay
Adjustable Wedge Pillow Set with Cushion Memory Foam Bed Triangle Pillow for Acid Reflux, Back Pain Relief & Sleep Support
Aliexpress UK
It's free from harmful chemicals, making it safe for you and your family while contributing to a greener planet. Customized Comfort Foam Cut to Size- Available in a wide array of sizes, our upholstery foam is ready to bring a new level of comfort to your living space.
eBay
Pillow Bed Pillow for Sitting and Lying Couples Butt Cushion Memory Foam Lumbar Support
Aliexpress UK
UPHOLSTERY / CRAFTS / CARAVAN CONVERSIONS / SEATING / BENCHES / HOBBIES. THIS IS FOAM SHEETS CUT TO SIZE 60" x 20" x (A DEPTH OF 1" - 5" OF YOUR SPECIFICATION). high density - blue. soft density - white / blue / grey / yellow.
eBay
Knee&Leg Pillows Foam Support Pillow for Sleeping for Back Pain,Leg Pillow for Sleeping On Side,Memory Foam Cushion Knee Support
Aliexpress UK
Upholstery polyurethane foam sheets in compact long sizes 20x40", 20x60", 20x80" and 18x90", with thicknesses 1/4"–5". Grades: Soft (SF21, 22–24 kg/m³), Medium (SF33, 31–34 kg/m³) and High-Density Firm (SF38, 38–40 kg/m³). Ideal for upholstery panels, cushion refills, DIY projects and packaging.
eBay
Memory Foam Cushion Waist Pillow Lumbar Support Office Pillow Chair Cushion Interior Accessories Pillow Car Seat Waist Brace
Aliexpress UK