Name: SX4 Box Spring Foundation
Brand: Stearns & Foster
SKU: 5637349502
Price: 232.5 USD
Availability: InStock

Our Sleep Experts® are available in-store, online or by phone or chat to help find your perfect mattress.

Need help deciding? Talk to a Sleep Expert®

Default Product Context

See if you’re prequalified with no impact to your credit bureau score.

with 24 Months Special Financing†

Delivery

Includes all Free delivery services plus:

Includes all Mattress Setup & Haul Away services plus:

Drop Ship

Parcel

Delivery and Shipping Services

Pay $1/Month

The Suggested Equal Monthly Payment shown above may be greater than the required minimum monthly payment that will be on your billing statement when you use the 24 month promotional financing offer. This estimated payment: <ul class="rte2-style-ul" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;"><li>Equals the promotional purchase amount divided by 24 rounded to the next highest whole dollar.</li><li>Would pay off the promotional purchase amount within 24 months, but only if there are no other balances on your account at any time during the 24 month promotional period and you make your payments on time. Your total payments will equal the amount of the promotional purchase amount.</li></ul> If the promotional purchase amount is not paid in full within 24 months, interest will be charged to your account from the purchase date and your total payments will be greater than the amount of the promotional purchase amount. IMPORTANT: The information about the Suggested Equal Monthly Payment shown assumes the following promotional financing offer is applied to the purchase: No Interest if Paid in Full Within 24 Months*** On purchases with your Mattress Firm Synchrony HOME Credit Card. Interest will be charged to your account from the purchase date if the promotional purchase is not paid in full within 24 months. Minimum monthly payments required.

Any suggested equal monthly payment shown which may exclude taxes and delivery in connection with this promotional offer: <ul class="rte2-style-ul"><li>May be greater than the required minimum monthly payment that will be charged on your billing&nbsp;statement;​</li><li>Equals the amount financed divided by the number of months in the promo period&nbsp;rounded to the next highest whole&nbsp;dollar,&nbsp;and&nbsp;​</li><li>Would pay off the amount financed within the promo period, but only if there are no other balances on your account at any time during the promo period and you make your payments on time.&nbsp; In such event, your total payments will equal the amount of the amount financed.&nbsp;​</li></ul>Qualifying purchase amount must be on one receipt. No interest will be charged on the promo balance if you pay it off, in full, within the promo period. If you do not, interest will be charged on the promo balance from the purchase date. The required minimum monthly payments may or may not pay off the promo balance before the end of the promo period depending on purchase amount, promo length and payment allocation. Regular account terms apply to non-promo purchases and, after promo period ends, to the promo balance. New Accounts as of 7/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Minimum Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval. Offer subject to change. Select promotions may display in online checkout.

Any suggested equal monthly payment shown which may exclude taxes and delivery in connection with this promotional offer:​ <ul class="rte2-style-ul"><li>May be greater than the required minimum monthly payment that will be charged on your billing&nbsp;statement;​</li><li>Equals the amount financed divided by the number of months in the promo period&nbsp;rounded to the next highest whole&nbsp;dollar,&nbsp;and&nbsp;​</li><li>Would pay off the amount financed within the promo period, but only if there are no other balances on your account at any time during the promo period and you make your payments on time.&nbsp; In such event, your total payments will equal the amount of the amount financed.&nbsp;​</li></ul>Qualifying purchase amount must be on one receipt.​ No interest will be charged on the promo balance if you pay it off, in full, within the promo period. If you do not, interest will be charged on the promo balance from the purchase date. The required minimum monthly payments may or may not pay off the promo balance before the end of the promo period depending on purchase amount, promo length and payment allocation. Regular account terms apply to non-promo purchases and, after promo period ends, to the promo balance. New Accounts as of 7/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Minimum Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval. Offer subject to change.Select promotions may display in online checkout.​

Any suggested equal monthly payment shown which may exclude taxes anddelivery in connection with this promotional offer: <ul class="rte2-style-ul"><li>May be greater than the required minimum monthly payment that will be charged on your billing&nbsp;statement;​</li><li>Equals the amount financed divided by the number of months in the promo period&nbsp;rounded to the next highest whole&nbsp;dollar,&nbsp;and&nbsp;​</li><li>Would pay off the amount financed within the promo period, but only if there are no other balances on your account at any time during the promo period and you make your payments on time.&nbsp; In such event, your total payments will equal the amount of the amount financed.&nbsp;​</li></ul>Qualifying purchase amount must be on one receipt. No interest will be charged on the promo balance if you pay it off, in full, within the promo period. If you do not, interest will be charged on the promo balance from the purchase date. The required minimum monthly payments may or may not pay off the promo balance before the end of the promo period depending on purchase amount, promo length and payment allocation. Regular account terms apply to non-promo purchases and, after promo period ends, to the promo balance. New Accounts as of 7/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Minimum Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval. Offer subject to change.Select promotions may display in online checkout.

††For 60 and 72 months in-store purchases taxes and delivery fees must be paid upfront and cannot be charged to your Mattress Firm credit card; upfront payment of taxes and delivery fees will not reduce monthly payment or amount financed. Qualifying purchase amount, less any applicable downpayment must be on one receipt. No interest will be charged on the amount financed and equal monthly payments are required on such balance until it is paid in full. The payments equal the amount financed divided by the number of months in the promo period, rounded up to the next whole dollar and may be higher than the payments that would be required if this purchase was a non-promo purchase. During the last month(s) of the promo period the required monthly payment may be reduced due to the prior months’ rounding. Any estimated required monthly payments shown which may exclude taxes and delivery in connection with this promotional offer should allow you to pay off the amount financed within the promo period if (1) you make your payments by the due date each month and (2) this is the only balance on your account during the promo period.If you have other balances on your account, this monthly payment will be added to the minimum payment applicable to those balances.Regular account terms apply to non-promo purchases. New Accounts as of 7/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Minimum Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval. Offer subject to change. Select promotions may display in online checkout.

No Interest if Paid in Full Within {defaultNumOfMonths} Months*** On purchases with your Mattress Firm Synchrony HOME Credit Card. Interest will be charged to your account from the purchase date if the promotional balance is not paid in full within {defaultNumOfMonths} months. Minimum monthly payments required.

^The Suggested Equal Monthly Payment shown above may be greater than the required minimum monthly payment that will be on your billing statement when you use the 24 month promotional financing offer. This estimated payment: <ul class="rte2-style-ul" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;"><li>Equals the promotional purchase amount divided by 24 rounded to the next highest whole dollar.</li><li>Would pay off the promotional purchase amount within 24 months, but only if there are no other balances on your account at any time during the 24 month promotional period and you make your payments on time. Your total payments will equal the amount of the promotional purchase amount.</li></ul> If the promotional purchase amount is not paid in full within 24 months, interest will be charged to your account from the purchase date and your total payments will be greater than the amount of the promotional purchase amount. IMPORTANT: The information about the Suggested Equal Monthly Payment shown assumes the following promotional financing offer is applied to the purchase: No Interest if Paid in Full Within 24 Months‡ On purchases $999 or more with your Mattress Firm Synchrony HOME Credit Card. Interest will be charged to your account from the purchase date if the promotional purchase is not paid in full within 24 months. Minimum monthly payments required.

You will receive a call, text and email the evening prior to your delivery date with a two-hour delivery window.

Drop-off to your front door, side door or garage. No signature or person required.

This item is backordered 6+ weeks.

In-home setup and removal of your old mattresses.

In-home setup and removal of your old mattress(s). Set up includes up to 3 mattress sets and adjustable bases.

Best for

Regular

Suggested equal payments of $40 with 6 months special financing.

Stearns & Foster

SX4 Box Spring Foundation

See a lower price somewhere else? We'll match it up to 120 nights with our Low Price Guarantee.

You want your perfect bed, and you want it quick—that’s why we offer Free & Fast Delivery.

Our Sleep Experts® get 200+ hours of training annually to help you find the perfect mattress, pillows & more within your budget.

Stearns & Foster SX4 Box Spring Foundation

Stearns & Foster SX4 Box Spring Foundation

Foundation

How to get