Unlike old box springs and sagging foundations, a quality mattress base provides a solid surface that ensures lasting support. Your mattress will remain in peak condition for years to come, alongside many sleep-supporting benefits: Improved sleep and comfort No mattress sagging Secured mattress placement Improved airflow Alongside Casper mattresses, our foundations are designed for long-lasting support. With our compact slat design, you won’t be bothered by gaps or sharp pressure points.