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Helix Core Midnight | Medium

Helix Core Midnight | Medium

Side Sleeper's Dream

Silver collection

7+ people bought

  • Medium Comfort Level: A balanced feel that suits both back and side sleepers without being too soft or too firm.
  • Instant Cooling Pillow Top: GlacioTex™ fabric delivers a refreshingly cool sleep surface right as you lie down.
  • Contoured Ergonomics: Zoned foam layers cradle shoulders and reinforce hips and lower back for optimal alignment.
  • Quiet Motion Isolation: Up to 1,000 individually wrapped coils absorb movement, keeping sleep disturbance to a minimum.
  • Edge-to-Edge Stability: Reinforced coil edges ensure a supportive surface across the entire mattress.
Mattress height:
11.5"
Sleep type:
  • Side sleeping position

    Side

    Back sleeping position

    Back

  • Mattress type:

    Individual pocketed coil

    Comfort/Feel:

    Medium

    Size Size guide

    This size will be back in stock in 5-7 days

    Call to order now

    Twin

    $998

    $749.95

    This size will be back in stock in 5-7 days

    Call to order now

    Twin XL

    $1,124

    $843.95

    This size will be back in stock in 5-7 days

    Call to order now

    Full

    $1,248

    $936.95

    Queen

    $1,332

    $999.95

    King

    $1,810

    $1,358.95

    Split King

    $2,248

    $1,686.90

    Bed frame options

    Total Price
    $936.95 $1,248 Save $311

    In stock. Delivery by August 25

    Our benefits

    100-Night Trial

    Free One-Day Delivery

    Lifetime Warranty

    Learn more

    Materials

    Construction of Mattress:

    6 Layer Design, 11.5" Profile

    • 0.75″ Gel‑Infused Foam quilted into GlacioTex™ Cooling Cover
    • 1.5″ Gel‑Infused Memory Foam Layer
    • 1″ Soft Responsive Foam Layer
    • 1″ Support Responsive Foam Layer
    • Up to 1,000 Individually Wrapped Coils with Reinforced Edge Support
    • 0.5″ Durable Base Foam
    • Shift-Resistant Lower Cove


    Basic Care: Spot clean with a mild detergent, such as upholstery cleaner. We highly recommend using a waterproof mattress protector to ensure the longevity of your mattress.

    Certifications

    All foams meet CertiPUR-US® standards for content, emissions, and durability, and are analyzed by independent, accredited testing laboratories.

    Protected by a chemical-free and fiberglass-free fire barrier meeting 16 CFR 1633 and 16 CFR 1632 compliance

    Warranty

    Lifetime Limited Warranty

    If defects in materials or workmanship arise, Helix Sleep will repair or replace your mattress for as long as you own it. Pair with Mattress King's 100-night risk-free trial for total peace of mind.

    View full warranty details here

    Where it’s made

    American Craftsmanship: Made in Arizona

    Expert Assistance Awaits

    Get expert advice from our sleep specialists to ensure your best night’s sleep.


    OR


    Prefer a Personal Touch? Book Your In-Store Visit to discover mattresses and sleep essentials customized for your comfort.

    View full details

    Medium Comfort Meets Cooling & Contoured Support

    The Helix Core Midnight combines a cooling GlacioTex™ pillow-top with adaptive gel memory foam and responsive transition layers. Zoned for ergonomic alignment and topped with breathable design, this hybrid supports your body where needed and keeps you cool. Individually wrapped coils offer responsive support and excellent motion control, while reinforced edges extend usable sleeping area for stability and comfort.

    layers
    firmness

    Firmness Scale

    1-3

    3-4

    4-6

    6-8

    8-9

    9-10

    Plush

    Medium-Plush

    Medium

    Medium-Firm

    Firm

    Extra-firm

    support

    Support

    Low

    Medium

    High

    circulation

    Pressure Relief

    Basic

    Average

    Advanced

    circulation

    Air Circulation

    Good

    Better

    Best

    Customer Reviews

    Discover what our customers say about Mattress King.

    4.9

    2,148 reviews

    Frequently Asked Questions

    Who is the Helix Core Midnight best for?

    This mattress is a great fit for back and side sleepers seeking medium support—neither too soft nor too firm. It offers balanced comfort that caters well to combination sleepers too.

    How well does it stay cool?

    Very well. The GlacioTex™ pillow top provides cooling to the touch, while gel-infused memory foam and breathable coils help regulate sleep temperature effectively. Several independent reviews rate its cooling performance highly

    I've seen Helix online. What's the benefit of buying from Mattress King?

    Buying from Mattress King gives you several key advantages. You can come into one of our 6 Oklahoma showrooms to try the Helix Midnight in person before you buy. You'll get our fast, 1-day local delivery instead of waiting for a box to ship. Most importantly, you get the dedicated service of a local team and the peace of mind of our 100-Night Comfort Guarantee, which allows for an easy, in-store exchange if needed.

    Do you offer delivery and old mattress haul-away services?

    Yes, at Mattress King, we provide convenient delivery services across Oklahoma. We pride ourselves on offering fast, one-day delivery options. For those who opt for our upgraded delivery service, priced at $99, we not only deliver but also set up your new mattress and haul away your old one. In addition to this, we offer a free delivery option that includes doorstep drop-off, similar to services provided by FedEx and Amazon. This option is great for those who prefer a contactless delivery to their front porch or door. For a comprehensive understanding of our delivery services and to find the best option for your needs, please visit our delivery information page here.

    Do you offer financing options?

    At Mattress King, we offer a variety of financing options to fit your budget. Our financing partners include Synchrony, Affirm, and Snap Finance, each offering distinct plans to accommodate different financial needs.

    Synchrony: For those with good credit, Synchrony provides a 12-month plan with 0% interest, helping you manage payments without additional costs.

    Affirm: Affirm offers flexibility with interest rates ranging from 0% to 36%. They provide three payment term options, allowing you to choose a plan that best suits your budget.

    Snap Finance: Ideal for those who might not have a strong credit history. Snap Finance considers other factors like a steady income and an active checking account. They offer a 100-day cash option and operate on a lease-to-own basis.

    Each of these options is designed to make your mattress purchase more manageable financially. You can explore these options and apply directly to find the one that aligns with your financial situation.