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Immunity Sienna Ultra Plush Copper Mattress

Regular price $2,299.00
Regular price Sale price $2,299.00
Sale Sold out

Our plushest model made for the sleeper who wants to be cradled by their mattress. Copper-infused memory foam layers along with our specialized buoyant, body-conforming HyPURGel™ foam provide for a super conforming and pressure-relieving feel. Features our premium spring system for enhanced support along with our NatuVerex™ copper fabric with cooling technology for added temperature regulation.  

Add our stylish, sturdy and easy-to-assemble foundation base to experience the mattress to its full potential. Upholstered wood construction. No tools required.

Have a promo code? Add it at checkout for additional savings.

Premium, heavy-duty models are of substantial weight. While not currently available for order online, you may try this model at select retail locations as we work on expanding our in-store network and our shipping options.

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*Discount codes applied at checkout.
Only one promo code can be used per order.

Want to try an Immunity Mattress in person?

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The Benefits of Copper

Enjoy comfort and support, along with the homeopathic benefits of copper, for a naturally restorative night’s sleep. Copper’s anti-bacterial and anti-microbial properties help to provide a cleaner sleeping environment and positively support overall health and well-being. Research has shown that copper can help to boost the immune system, increase circulation and reduce inflammation.

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Premium hybrid construction is infused with copper for added support and comfort for a more restful night’s sleep. Features reinforced edge support, responsive and supportive individually wrapped coils that work in tandem with the comfort layers to conform to the body and minimize partner disturbance. Adjustable base friendly.

ICE NatuVerex Copper Cover
Patented yarn technology features 30% copper content (more than other copper fabrics) that is effective through up to four layers, plus cooling technology

Copper Memory Foam
Provides several health benefits while enabling more sound sleep

Copper Memory Foam
Provides several health benefits while enabling more sound sleep

HyPURGel Foam
Optimal temperature control and invigorating supportive comfort

Premium Quantum® Edge Coil Unit
Premium individually encased coil unit with edge-to-edge support, reducing the feeling of roll-off while minimizing movement transfer across the mattress

Base Foam
Foundational durability you can count on year after year


Product Dimensions Weight
Twin 38"W x 75"L x 14"H 76 lbs
Twin XL 38"W x 80"L x 14"H 81 lbs
Full 53"W x 75"L x 14"H 103 lbs
60"W x 80"L x 14"H 120 lbs
King 76"W x 80"L x 14"H
150 lbs
Cal King 72"W x 84"L x 14"H 149 lbs


We designed our hybrid mattresses with families in mind so you can rest easy knowing that the foams used are CertiPUR-US® certified, and for models with natural latex layers, the latex is OEKO-TEX® Standard 100 certified or GOLS certified, depending on the model.



    Mattress only, or mattress + foundation are made upon order. Once produced, it will be at your doorstep in a few days via FedEx Ground, UPS Ground or comparable shipping service.


    Immunity mattresses, purchased on this site only, come with a risk-free 100-night trial. While we’re confident you will love your new mattress, if you don’t fall in love in 100 nights, we’ll give you the option of a refund or one-time comfort exchange. Keep in mind that the first 30 nights on your new mattress are a critical adjustment period as your body adapts to your new bed. If after 30 nights but before 100 nights the Immunity mattress is not right for you, contact us. For more information, see our Returns & Refunds page.


    Immunity mattresses bought online at this site have a 10-Year or 15-Year Limited Warranty, depending upon which model you purchased! You can find our warranty details here.


    We’ve tested the Immunity mattresses on a slatted bed frame, on top of a sturdy bed base and on an adjustable bed base. It is designed to work on any of those firm, flat surface.


    Your new mattress is heavy! Ask a friend to help you lift and unpack it.

    Use care when cutting! We have provided you with a tool for cutting the inner packaging materials. Be very careful to ensure that you do not accidentally cut your new mattress or the top material.

    1. Carefully slide compressed mattress out of box.
    2. Using the cutting tool provided, cut and remove outer plastic wrapping. The inner part of the vacuum-sealed plastic will remain intact.
    3. NOTE: Depending on the mattress you’ve received, you may need to unfold the compressed mattress after unrolling it, or you may just need to unroll it before removing final layer of plastic. Please take a moment to consider that before proceeding to the next step.
    4. Unroll and unfold (or just unroll) the mattress and position it on your base. Carefully cut and remove final layer of sealed plastic from the mattress.
    5. Carefully discard all packaging materials immediately after removal to avoid any hazard. Keep all packaging away from children.
    6. Allow your mattress to decompress naturally for the first 24–48 hours. Once it is fully expanded, manipulate the corners and sides to square it off as best as possible.

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    Free, No-Contact Delivery

    We charge absolutely NO SHIPPING FEES ever. Just place your order, and we’ll take care of the rest. Safe, no-contact delivery to your doorstep via FedEx or UPS Ground.

  • icon with the number 100 in a circle badge


    It takes at least 30 nights for your body to adjust to a new mattress. But we didn’t stop there. You have 100 nights of sleep to decide if Immunity is the right fit for you.

    *For mattresses available and purchased on this site only,

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    Made Upon Order in the USA

    We believe, in order to bring you the highest quality product, we need to be able to oversee every aspect of production. This also allows us to continue providing opportunities for our workforce at home.

  • Try it at a store

    Visit a store to lay on and feel our mattresses in person. Various Immunity models are available for purchase in select regions. See our Retailer List to find a location near you.

    Find an Immunity Retailer 
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