Best replacement sofa seat cushions

Start here: Custom Couch Seat Cushions (Rulaer). Made to your measurements in any shape, with a high-density foam core and a zippered cover — the closest thing to getting your original cushions back, and the best-rated of the lot.

Who the others suit:

• HOMBYS 6″ 24″x27″ — a straight swap for standard square seats when you just want fresh foam and batting.
• Extra Thickness 5-layer 24″x27″x6″ — for sagging frames that need a taller, firmer seat.
• Codi 2-pack, tufted velvet — a quick cosmetic refresh in navy.
• Foamma 4-pack — budget foam blocks if you already have covers.
• Sabai inserts — simple inserts for a modern sofa.

Measure your seat depth and width before ordering; thickness is the one spec you can't fix later.