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12" Sierra Gel Hybrid Medium Mattress in a bright, finished bedroom

Mack Mattress Essentials

12" Sierra Gel Hybrid Medium Mattress

Nationwide Shipping — $50Ships in a Box

Fresh, cool, and supportive — the Sierra is designed to make great sleep easy. With a 12” hybrid profile, Sierra blends the refreshing comfort of swirled CoolGel memory foam with the reliable support of individually wrapped coils, creating a balanced feel that works for a wide variety of sleepers.

Current price range

$449–$849

Estimated from $13.66/month with PayTomorrow. See financing and apply

Availability

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Choose your exact configuration

Try it in the Columbus showroom

Exact option pricing

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Local help when wanted

Material category: Gel material
Certification: GREENGUARD Gold Certified
Hybrid construction
Firmness: Medium

The right bed. The right support. No pressure.

Put this item in context before you choose.

Fresh, cool, and supportive — the Sierra is designed to make great sleep easy. With a 12” hybrid profile, Sierra blends the refreshing comfort of swirled CoolGel memory foam with the reliable support of individually wrapped coils, creating a balanced feel that works for a wide variety of sleepers. Right beneath the breathable grey waterfall cover, a thick layer of CoolGel memory foam cushions your body and relieves pressure while drawing away excess heat for a cooler, more refreshing night’s rest. A transition layer of high-density comfort foam smooths the shift into the pocketed coil support system, which adapts to your body, isolates motion, and provides edge-to-edge stability so you can stretch out comfortably. The result is a mattress that feels airy, supportive, and effortless — bringing you cooling comfort and dependable support at a price that makes better sleep more accessible than ever. - 12” Hybrid Design – Balanced comfort + support - Pro Gel™ Memory Foam – Cooling pressure relief with a fresh, buoyant feel - Pocketed Coil System – Durable stability + reduced motion transfer - Breathable Waterfall Cover – Soft, modern, and built for airflow - Everyday Value – Premium comfort without the premium price

A specification can help narrow the field, but it cannot decide the feel for you. Tell Mack what is not working now, what you notice at night, and what feels better as you compare.

Need a detail that is not here? Ask us. We would rather give you a clear answer than guess.

4.7 on Google

Helpful service. No pressure. That’s what people remember.

5.0
“They found the right balance of firmness and soft support for us. We have been sleeping comfortably ever since.”

Wendy S. · Google review

5.0
“You can tell this family-owned business cares about its products and customers. The price and warranty were hard to beat.”

Kennedy C. · Google review

5.0
“Steven was knowledgeable, patient, and helpful. He made the whole process easy and answered every question clearly.”

Amanda K. · Google review

5.0
“Knowledgeable, engaging, and genuinely no-pressure. I visited several stores, then came back to Mack to make my purchase.”

Grant C. · Google review

5.0
“A big purchase felt simple and straightforward. Steven asked the right questions and helped us find our best fit.”

Megan M. · Google review

5.0
“Great experience. Steven was helpful, informed, and kind. I would absolutely recommend Mack Mattress.”

Jeryl K. · Google review

5.0
“We bought four mattresses for college, a first apartment, and our home. They understood what we needed every time.”

Christy D. · Google review

5.0
“We have purchased three mattresses here. They focus on value, start with your budget, and never try to upsell you.”

Austin K. · Google review

5.0
“Both of my experiences were exceptional. When I needed a different size, the exchange was seamless and the team went above and beyond.”

Loretta P. · Google review

5.0
“Friendly, personable, and knowledgeable without being pushy. I will not buy a mattress anywhere else.”

Adam V. · Google review

5.0
“The team was friendly and helpful, never salesy. There was a great selection of beds at affordable prices.”

Seth S. · Google review

5.0
“They found a great mattress in our price range, delivered it, and picked up the old one. The whole experience was easy.”

Dylan M. · Google review

5.0
“They found the right balance of firmness and soft support for us. We have been sleeping comfortably ever since.”

Wendy S. · Google review

5.0
“You can tell this family-owned business cares about its products and customers. The price and warranty were hard to beat.”

Kennedy C. · Google review

5.0
“Steven was knowledgeable, patient, and helpful. He made the whole process easy and answered every question clearly.”

Amanda K. · Google review

5.0
“Knowledgeable, engaging, and genuinely no-pressure. I visited several stores, then came back to Mack to make my purchase.”

Grant C. · Google review

5.0
“A big purchase felt simple and straightforward. Steven asked the right questions and helped us find our best fit.”

Megan M. · Google review

5.0
“Great experience. Steven was helpful, informed, and kind. I would absolutely recommend Mack Mattress.”

Jeryl K. · Google review

5.0
“We bought four mattresses for college, a first apartment, and our home. They understood what we needed every time.”

Christy D. · Google review

5.0
“We have purchased three mattresses here. They focus on value, start with your budget, and never try to upsell you.”

Austin K. · Google review

5.0
“Both of my experiences were exceptional. When I needed a different size, the exchange was seamless and the team went above and beyond.”

Loretta P. · Google review

5.0
“Friendly, personable, and knowledgeable without being pushy. I will not buy a mattress anywhere else.”

Adam V. · Google review

5.0
“The team was friendly and helpful, never salesy. There was a great selection of beds at affordable prices.”

Seth S. · Google review

5.0
“They found a great mattress in our price range, delivered it, and picked up the old one. The whole experience was easy.”

Dylan M. · Google review