Medium NM® Sealy® Mattresses and Accessories
NM mattresses are National Mattress's own line — quality construction at honest, direct prices across firmness levels and builds. Compare every option below by feel, size, and price.
Sealy is a pioneering mattress brand known for its science-backed support and comfort, with over a century of quality craftsmanship behind it.
Shop Sealy across the Essentials, Cocoon™, Posturepedic®, Posturepedic® Plus, Posturepedic® Luxury and Posturepedic® Natural Origins collections, in single/twin through king. Every Sealy we carry is made in Canada and backed by the manufacturer warranty terms, plus our sleep trial and price match guarantee.
How to Choose the Right Sealy Mattress
Most Sealy® support systems are zoned, which means the coil layer is not set to a single firmness from head to foot. A zoned unit varies firmness by position along the bed, and Sealy concentrates the reinforcement in the centre third, where the hips and the small of the back load it hardest. That is the job Sealy gives the Posture Grid® Coil System featuring PostureSense™ Nano Coils. It is worth saying plainly that zoning is not a better surface than a uniform one, only a different one, and that it answers position rather than body weight: a surface that holds one firmness right across is exactly what many innerspring buyers are after. Posture Touch® Pocket Coils take the other route, wrapping each spring so it compresses on its own and follows your outline in smaller increments.
The SealyMAX Core System featuring SealyResponse™ PRO and SolidSupport™ Pocket Coils is the other name to know. Sealy positions it for spinal alignment and pressure relief rather than for one location inside the build, and the mechanism it publishes for SolidSupport is double packing: 117 coils in the centre third, so the busiest band of the bed carries more springs rather than stiffer wire. The SealyResponse™ HD Pocket Coil is a further pocket coil in the same family, and Sealy publishes no wire specification for it, so compare the models it appears in rather than reading anything into the letters. Above the coils two foams do two jobs: memory foam is viscoelastic and softens against body heat to mould around a shoulder, while resilient polyurethane foam springs straight back and suits transition and base layers that must hold their shape rather than cradle. Firmness comes as Firm, Medium and Plush.
Zoned by Position
A zoned unit varies firmness along the length of the bed rather than responding differently to two body weights. Our zoned lumbar support explainer shows how the zones are laid out.
Centre Third Reinforced
SolidSupport double packs 117 coils into the centre third, so the band under your hips carries more springs rather than stiffer wire. Sealy positions the SealyMAX Core System for spinal alignment and pressure relief.
Two Foams, Two Jobs
Memory foam moulds slowly and absorbs movement, while resilient polyurethane rebounds fast and holds structure. Most builds use both, each where its behaviour helps.
Frequently Asked Questions About Sealy Mattresses
How does a zoned coil system differ from a uniform coil layer?
What do PostureSense Nano Coils add to the comfort layer?
How do the SealyMAX Core System and the SealyResponse HD Pocket Coil differ?
Is the polyurethane foam in a Sealy mattress the same thing as memory foam?
Which Sealy firmness should I look at if I wake up with a sore lower back?
Does a Sealy mattress need a matching foundation or boxspring?
Want Help Comparing Sealy Support Systems?
Our non-commissioned sleep experts can explain what each coil system changes and which firmness matches how you actually sleep, and you can read the terms of our sleep trial first.
Upgrade your sleep at National Mattress
Discover a mattress that transforms your sleep into a truly rejuvenating experience. We offer a wide variety of options to suit every sleep style and preference, ensuring a better night's sleep.
Why Choose Us?
- Variety: From plush to firm, we have options for every body type and sleep style.
- Quality: Trusted brands and top-notch materials for long-lasting comfort.
- Sleep Trials & Warranties: Enjoy peace of mind with flexible trials and warranties.
- Expert Advice: Get personalized recommendations from our sleep specialists.
Mattress Selection Includes
- Memory Foam: Contours to your body for personalized comfort and pressure relief.
- Hybrid: Combines responsive springs with foam for balanced support and comfort.
- Innerspring: Provides firm support, bounce, and cooling airflow.
- Latex: Hypoallergenic, eco-friendly, and exceptionally comfortable.
- Adjustable Beds: Customize your sleep position for optimal comfort.
