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    Mattress Comparison
    Beautyrest Black K-Class mattress

    Beautyrest Black K-Class

    VS
    Saatva RX mattress

    Saatva RX

    Beautyrest Black K-Class vs. Saatva RX

    Side-by-side comparison of the Beautyrest Black K-Class (Hybrid (Pillow Top)) and Saatva RX (Luxury Hybrid). Compare comfort, cooling, support, value and more — based on our lab testing.

    Winner: Saatva

    By Sleep Sage Editorial Team

    Side-by-side mattress testing · 144+ comparisons published

    Updated May 2026
    Category
    Beautyrest Black K-Class
    Saatva RX
    Comfort
    9.5/10
    9.4/10
    Support
    8.8/10
    9.8/10
    Cooling
    9.3/10
    9.2/10
    Edge Support
    9.2/10
    9.5/10
    Motion Isolation
    9/10
    9/10
    Durability
    9.3/10
    9.6/10
    Value
    8/10
    8/10

    Quick Specs Comparison

    Spec
    Beautyrest Black K-Class
    Saatva RX
    Price (Queen)
    $3,499
    $2,932
    Type
    Hybrid (Pillow Top)
    Luxury Hybrid
    Firmness
    4/10
    3.5/10
    Height
    16.5 inches
    15 inches
    Trial
    100 nights
    365 nights
    Warranty
    10 years
    Lifetime
    Shipping
    Free white glove delivery
    Free white glove delivery

    Key Advantages

    Why Choose Beautyrest Black K-Class

    • Incredibly plush pillow-top comfort
    • BlackICE 4.0 cooling on BOTH sides
    • 16.5" height — most luxurious profile

    Why Choose Saatva RX

    • Specifically engineered for chronic pain conditions (sciatica, arthritis, scoliosis)
    • Patented Lumbar Zone® quilting for targeted spinal alignment
    • Rx Wave-Tech® 5-zone pressure relief system

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    Brands behind these picks

    Before you buy, read the brand: construction, pricing bands, trial and warranty terms, and how each company's lineup performed in our Encinitas lab.

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