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The Casper Slate 11" Firm - Mattress in a Box

The Casper Slate 11" Firm - Mattress in a Box

Prices as of September 26, 2026, as listed by each retailer — verify the current price on the retailer's site before purchase.

Price history tracked at JCPenney price tracker

14-day low
$827.78
Sep 13 · JCPenney
Best price
$1,820
−0% vs high
14-day high
$1,820
All stores
$1,820$1,324$828
Sep 13Sep 26
  • JCPenney
Lowest in 14 days: $827.78 at JCPenney. Highest: $1820.00. Current best is 0% below the 14-day high.

About this product

The Casper Slate 11" Firm Mattress in a Box is a memory foam mattress designed for firm support and pressure relief. It features three layers of premium foam, including a breathable flex foam top layer that responds to body contours while promoting airflow. The knit cover offers stretch for comfort, and the durable core resists sagging. Ideal for adjustable bases, this mattress provides long-term support and is easy to set up. It is CertiPUR-US certified and made in the US.

  • 11" firm memory foam
  • Twin size dimensions
  • CertiPUR-US certified
  • Breathable flex foam top
  • Easy setup, no assembly
  • 600 lb weight limit

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The Casper Slate 11" Firm - Mattress in a Box — Price History