{"product_id":"foamma-upholstery-foam-blocks-4-x-20-x-20-4-pack-high-density-4-thick-cushion-inserts-certipur-us","title":"Foamma Upholstery Foam Blocks 4\" x 20\" x 20\" — 4-Pack High-Density 4\" Thick Cushion Inserts, CertiPUR-US","description":"\u003cp\u003e\u003cstrong\u003eFoamma's 4\" x 20\" x 20\" high-density upholstery foam pads are firm, resilient cushion inserts designed to restore seating comfort and structure for chairs, sofas, and DIY upholstery projects.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese pre-cut foam blocks arrive as a convenient four-pack sized for small to medium cushions, replacement seat cores, craft uses, and repairs. Manufactured in the USA and CertiPUR-US certified, the foam balances lasting support with low emissions. Each block is simple to trim or layer for a tailored fit and slips into covers or frames for fast refurbishment of worn seating or new handmade cushions.\u003c\/p\u003e\n\n\u003ch3\u003eHow will these foam blocks perform for everyday seating?\u003c\/h3\u003e\n\n\u003cp\u003eThe high-density formulation resists sagging and offers firm support for frequently used seats. They maintain shape through repeated sit-stand cycles and recover quickly after compression, making them suitable for dining chairs, occasional armchairs, bench seating, and tight sofa cushions.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eFirm, high-density core engineered for durability and shape retention\u003c\/li\u003e\n  \u003cli\u003e4-inch thickness provides noticeable lift and seating support\u003c\/li\u003e\n  \u003cli\u003ePre-cut 20\" x 20\" footprint fits many standard cushion covers\u003c\/li\u003e\n  \u003cli\u003eWorks well layered or trimmed to fine-tune comfort level\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan I customize or trim these foams to fit my project?\u003c\/h3\u003e\n\n\u003cp\u003eYes — the blocks are easy to cut with a serrated knife, electric carving knife, or foam saw for a custom fit. Because each piece is a simple rectangular block, you can stack, glue, or carve edges to match complex seat shapes without special tools.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eTrims cleanly with household cutting tools for precise sizing\u003c\/li\u003e\n  \u003cli\u003eStack multiple blocks to increase thickness or firmness\u003c\/li\u003e\n  \u003cli\u003eCompatible with common upholstery adhesives and fabrics\u003c\/li\u003e\n  \u003cli\u003eWorks for DIY pillows, pet beds, boat seating, and bench cushions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat makes this foam a safe and reliable choice indoors?\u003c\/h3\u003e\n\n\u003cp\u003eFoamma foams are CertiPUR-US certified, meaning they are manufactured without certain harmful chemicals and have low volatile organic compound (VOC) emissions. That lowers odours and supports healthier indoor air quality versus non-certified foams.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eMade in the USA under controlled manufacturing standards\u003c\/li\u003e\n  \u003cli\u003eCertiPUR-US certified for low VOCs and restricted chemicals\u003c\/li\u003e\n  \u003cli\u003eFirm density helps maintain cushion structure over time\u003c\/li\u003e\n  \u003cli\u003eNeutral scent that dissipates quickly when first unpacked\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I care for these foam inserts once installed?\u003c\/h3\u003e\n\n\u003cp\u003eFoam cores themselves should be kept dry and supported by a breathable cushion cover or case. Removing and airing the foam occasionally helps freshness; the outer cover of a finished cushion can typically be spot-cleaned or machine washed if the fabric allows.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eKeep foam dry; avoid prolonged moisture exposure\u003c\/li\u003e\n  \u003cli\u003eUse removable covers for easy washing and protection\u003c\/li\u003e\n  \u003cli\u003eRotate cushions periodically to encourage even wear\u003c\/li\u003e\n  \u003cli\u003eSpot-clean stains on the cover; air out foam when possible\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: These 4\" x 20\" x 20\" Foamma blocks are ideal for homeowners refreshing seat cores, upholsterers needing standardized filler for repairs, crafters building custom pillows or pet beds, and small-business furniture refurbishers. If you want a firm, long-lasting core that’s easy to trim and safe for indoor use, this four-pack offers a ready-to-use solution without the wait or expense of custom fabrication.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are these foam blocks washable?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The foam itself should be kept dry; use removable covers for washing. Spot-clean covers or machine-wash according to fabric instructions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I cut the foam to a different size?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — Foamma blocks cut cleanly with a serrated knife or foam saw so you can trim or stack them for a custom fit.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Foamma","offers":[{"title":"Default Title","offer_id":55300780982609,"sku":"B07WTRC57Y","price":131.35,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1086\/5567\/3681\/files\/foamma-front-view-pack-of-four.jpg?v=1791975405","url":"https:\/\/craftiche.co.uk\/products\/foamma-upholstery-foam-blocks-4-x-20-x-20-4-pack-high-density-4-thick-cushion-inserts-certipur-us","provider":"Craftiche","version":"1.0","type":"link"}