Casper is the brand that helped start the memory foam mattress craze, and it’s still one of the best in the business. The company offers high-quality mattresses at a fraction of the price of traditional innerspring mattresses, and today those prices are even lower than normal. On Tuesday, for one day only, Amazon is slashing 20% off Casper Sleep Essential Memory Foam 8.5 Inch Mattresses in every size, from Twin and Full to Queen and King. That’s right, you can pick up a brand new Queen mattress for $480 and a King for only $580 — and of course you still get the 100 night money back guarantee that Casper made famous!

Here are some important details from the product page:

  • HYBRID 3-LAYER FOAM MATTRESS: With the Casper Essential, you get support, breathability, and comfort in three quality layers — all at an affordable price. The streamlined design has our signature “just right” feel, with a soft, breathable top layer and curve-cradling memory foam layer below. The strong base foam adds durability, and the upholstery-grade cover stands up to years of use.
  • UNIVERSAL COMFORT: The equal balance of softness and support means all kinds of sleepers find the Casper outrageously comfortable.
  • SLEEPS COOL: There’s a myth that foam mattresses get hot at night — but that’s not the case with the Casper Essential. The open cell foam top layer allows heat to dissipate, and the woven cover encourages air flow to keep things nice and breezy.
  • MINIMAL MOTION TRANSFER: Thanks to our unique combination of foams, you won’t feel your partner (or your pet) move around in bed.
  • AWARD WINNING: Everyone’s talking about Casper — from Refinery29 calling us “the internet’s favorite mattress” to winning Good Housekeeping’s Lab Pick in 2018. We were even recently named America’s #1 Rated Mattress Brand by a leading consumer publication (rating comfort, value, support, durability, and repurchase intent).
  • RISK-FREE 100 NIGHT TRIAL: Not convinced? Zzz it for yourself. The Essential comes with a risk-free, 100 night trial, so you can try the mattress in your own home. If you don’t love it, contact Amazon and ask for the large item pickups team for your return. You’ll get a full refund. Also comes with a 10 year industry standard warranty.

Follow @BGRDeals on Twitter to keep up with the latest and greatest deals we find around the web. Prices subject to change without notice and any coupons mentioned above may be available in limited supply. BGR may receive a commission on orders placed through this article, and the retailer may receive certain auditable data for accounting purposes.