Underneath. Take the cushions off and measure the bare deck they were resting on. Cushions overhang the frame by an inch or two on every side, so the deck is the measurement that matches you to the right board. Width is the inside of one arm straight across to the inside of the other. Depth is the front edge of the deck straight back to the backrest.

No. One board covers the whole seat. The width you are looking for is arm to arm across the entire deck, not the width of a single cushion. The board is hinged so it folds flat to ship and opens out across the full width.

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.

On purpose. You are matched to the deepest board that still tucks fully inside your seat area. Sitting entirely on the deck, with nothing reaching past the front edge, is what lets it lie flat and carry your weight evenly across the whole seat.

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.

Send us the numbers before you order. Give us the inner width, the seat depth and what the piece is, and we will tell you which board suits your seat, or tell you plainly if none of them do. We would rather answer that now than have you guess.

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.

Worth the extra minute. The board is at its best when it sits fully on the deck, 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 deck, round down to the nearest half inch, and let the size finder do the matching. If you want a person to check it, send us the numbers and we will confirm before you order.

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

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

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.

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.