It sits under your seat cushions and gives them a firm, even base to rest on. When the webbing or springs underneath have stretched out, the cushions have nothing solid to land on, and you sink. The board puts that support back.

You do not have to work it out yourself. Pick your furniture in the size finder and it shows you the ranges we make, as buttons. Choose the one your seat falls into and it does the matching.

It is worth the extra minute to get this right. The board is at its best sitting fully on the seat base, arm to arm, with nothing reaching past the front edge, because that is what spreads your weight evenly across the whole seat. Measure the bare seat base, round down to the nearest half inch, and if you would like a person to confirm it, send us the numbers before you order.

The board itself, for as long as you own it. If it cracks, splits, or the panels come apart, we replace it free. Send us a photo and we will send a new one. You keep the old one, there is nothing to ship back. A warranty card comes in the box. This covers faults in the product, not damage from something else happening to it.

Under. It rests on the seat base of the sofa, with the cushions on top of it.

No. It is sized to sit inside the seat area and disappear under the cushions, and it does not raise the seat height noticeably. Confirming your measurement before you order is what keeps it that way.

Yes. No tools. Lift the cushions off, lay the board flat on the seat base, put the cushions back. About a minute.

Half-inch solid wood support panels wrapped in a protective fabric cover. All the support comes from the wood inside. The fabric keeps it off your upholstery and helps the board stay put.

400 lb across the product, and over 280 lb on a single board.

Yes. Measure both sections separately, the long run and the chaise, since they are usually different depths. The size finder will tell you if you need two pieces.

Yes, as long as you pick the matching depth. We go up to 30 inches deep.

It helps when the problem is soft support underneath the cushions, which is the usual cause. It will not rescue a cracked frame or snapped springs. If you are not sure which one you have, send us a photo of the bare seat base and we will tell you straight.

It helps with the sag, but it will not fully cancel out the folding mechanism underneath. Go in expecting an improvement rather than a fix.

Installed under the cushions at the right size, it stays put in normal use. The fabric surface gives the cushions something to grip, so they stop drifting toward the middle as well.

Usually not. Most people find the cushions were never the problem, they just had nothing solid under them. If your cushions are thin and worn right through, this will not make them thick again.

No. The cover is bound with finished edges so bare wood never touches fabric or leather, and the corners are rounded. This is the thing customers who tried bare plywood first mention most.

Many customers tell us a firm, level seat is easier on their back than a seat they sink into, and easier to get out of. It is a comfort product, not a medical device, and we would not claim more than that.

Take the smaller one. It sits fully inside the seat area, which is where you get firm, even support right across the seat, and the panel gaps can be closed up to bring a slightly narrow one in. If you would rather have someone confirm it, send us the numbers first.

It makes the seat firmer than it is now, which is the whole point. Most people are looking for exactly that. If you like sinking into your sofa, this is not for you, and we would rather say so here than have you send it back.

Free shipping across the 48 contiguous states, usually about five business days. Tracking is emailed when it ships. We do not currently ship to Alaska, Hawaii or military addresses.

You have thirty days. Return shipping is at your cost, and the refund goes out as soon as it arrives back in good condition. Easier still: send us your measurements first and we will confirm the size before you buy.