21.5"x54" Heavy Duty Fix Sagging Loveseat Couch Cushion Support Board | Anti-Slip Under-Cushion Supporter, Foldable, Tool-Free Install, Extend Sofa Life, Skip Costly New Couch Replacement • 【 Instant Sag Repair & Restore Comfort】 - Fix sagging couch cushions in 60 seconds without tools, furniture damage, or expensive replacement. Eliminates the frustrating "sinking hole" feeling and instantly restores firm, supportive seating—making your old sofa feel brand new. • 【 Heavy-Duty Wood Support (400 LBS Capacity)】 - Constructed with multi-layer composite panels, stronger than flimsy MDF, cardboard, or thin plywood. Supports up to 400 lbs, won’t bend, crack, warp, or collapse, providing long-lasting stable support for daily use. • 【 Universal Fit & Hidden Design】 - Foldable/stackable with 11 sizes available, perfectly fits couches, loveseats, sectionals, recliners, and chairs. Lays flat and stays completely hidden under cushions, conforms tightly to sofa frame for a seamless, secure fit. Not compatible with attached or non-removable seat cushions. See our sizing guide in the images for the right sofa support board for your furniture. • 【 Anti-Slip & Furniture Protection】 - Double-sided non-slip 600D Oxford fabric with silicone grip dots prevents shifting or sliding. Smoothly rounded edges protect upholstery from tears, snags, and scratches—safe for homes with kids and pets. • 【 Easy Installation & Worry-Free Warranty】 - Tool-free setup in seconds: remove cushions, place the board,