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Harmony Chill 3.0

Sleep Foundation Special Offer

Use this SleepFoundation.org link for the most current discount on MLILY mattresses


MLILY was founded in 2003 with a focus on creating foam mattresses that sleep cool. MLILY products are currently available in more than 72 countries. MLILY USA has its headquarters in Tennessee, with the factory based in South Carolina.

Among the many mattresses offered by MLILY is the Harmony Chill 3.0, a five-layer foam mattress with a 13-inch profile. The mattress incorporates a breathable cover, phase change material, and multiple specialty foams designed to improve temperature regulation. In terms of firmness the mattress is medium, or 5 out of 10.

The Harmony Chill 3.0 Mattress is one of three models in the Harmony collection. The Harmony+ is similar to the Harmony Chill 3.0 but with fewer layers. The Harmony Chill 2.0 is similar to the Harmony Chill 3.0 model, but it’s designed to be slightly firmer.

We’ll discuss the pricing, materials, construction, and performance of the MLILY Harmony Chill 3.0 Mattress. We’ll also cover how this bed performs for sleepers of different body types and preferred sleep positions, and go over MLILY’s policies regarding shipping and warranty coverage.

Price Range

$2,299 – $2,990

Mattress Type





















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Ideal For:

  • Couples who share a bed
  • Side or back sleepers under 130 pounds
  • Those who sleep hot but prefer a foam mattress
  • Shoppers with a high-end budget
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  • May be too soft for stomach sleepers, especially those over 130 pounds
  • Weak edge support may diminish usable sleep surface
  • High price-point for a foam mattress
  • No sleep trial, and customers must pay shipping costs


Motion Isolation:

Temperature Control:

Pressure Relief:

Edge Support:

Ease of Movement:


Off Gassing:

Mattress Performance

Motion Isolation

The MLILY Harmony Chill 3.0 Mattress excels at isolating motion. Its foam comfort layers and polyfoam support core absorb movement, helping the mattress remain still and silent when sleepers get in and out of bed or change positions. Those who sleep with a partner should not be disturbed by their partner’s movements during the night.

In general, memory foam absorbs motion well. The Harmony Chill 3.0’s all-foam construction and medium (5) firmness help it stand out.

Pressure Relief

Pressure relief is a strong point of the MLILY Harmony Chill 3.0 Mattress. The polyfoam and memory foam comfort layers provide body contouring to help relieve pressure on a sleeper’s joints. At the same time, the polyfoam support core is designed to ensure that the sleeper’s body remains aligned and even.

Side and back sleepers under 130 pounds experience optimal pressure relief on the MLILY Harmony Chill 3.0 Mattress. Sleepers over 130 pounds sink deeper into the mattress, which may lead to pressure buildup in some cases.

Temperature Control

The MLILY Harmony Chill 3.0 sleeps relatively cool for a foam mattress. The cover is made with a breathable knit fabric, and the first layer of polyfoam is coated with phase change material (PCM) designed to dissipate body heat. The bamboo charcoal and gel infusions are also designed to reduce heat retention, and the convoluted polyfoam layer helps promote airflow.

Temperature control is a common issue with all-foam mattresses, which leave little room for heat to escape. Compared to others in its category, the Harmony Chill 3.0 Mattress performs slightly better due to its multiple temperature-regulating features.

Edge Support

Sleepers may find that the perimeter of the MLILY Harmony Chill 3.0 Mattress sags under pressure. This lack of edge support may push sleepers to the center of the mattress in order to avoid feelings of roll-off. Weak edge support can also make it more difficult to get out of and into the bed.

It’s normal for all-foam beds to lack edge support, especially for those with a soft or medium feel. The MLILY Harmony Chill 3.0 Mattress performs on par with other similarly constructed mattresses. Shoppers looking for sturdy edge support may want to consider a firmer mattress or one with an innerspring support core.

Ease of Movement

Sleepers shouldn’t have too much trouble changing positions or moving across the surface of the MLILY Harmony Chill 3.0 Mattress.

Foam mattresses generally allow sleepers to sink in, making movement across the bed more challenging. This is most evident in mattresses with thick layers of memory foam. Because the Harmony Chill 3.0 contains more polyfoam, it’s more responsive than many all-foam models. Its medium firmness also provides better ease of movement than a softer mattress would.

Body weight can also be a factor with movement. Sleepers over 230 pounds tend to sink more into the mattress, making it more difficult to move around. These sleepers may find better ease of movement in a firmer mattress, or a model made with innersprings or latex.


The MLILY Harmony Chill 3.0 Mattress has both benefits and drawbacks for sex. The mattress provides traction and adequate ease of movement, though it lacks bounce.

The mattress also has weak edge support, which may limit positioning and constrain couples to the middle of the bed. On the other hand, it’s virtually silent when bearing weight.


Many boxed mattresses off-gas when they are removed from the box. These chemical odors are particularly common in mattresses with memory foam and polyfoam layers. The MLILY Harmony Chill 3.0 Mattress produces moderate off-gassing.

MLILY recommends unboxing the mattress in a well-ventilated area and allowing it to air out for about 24 hours before use. Off-gassing smells may linger for a few more days, but these are not generally considered harmful.

MLILY Harmony Chill 3.0 Mattress Coupon

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Use this SleepFoundation.org link for the most current discount on MLILY mattresses

Sleeping Style and Body Weight

Sleeper Type

Under 130 lbs

130-230 lbs

Above 230 lbs

Side Sleepers Icon

Side Sleepers

Under 130 lbs

130-230 lbs

Above 230 lbs

Backsleepers Icon

Back Sleepers

Under 130 lbs

130-230 lbs

Above 230 lbs

Stomach Sleepers Icon

Stomach Sleepers

Under 130 lbs

130-230 lbs

Above 230 lbs

Side Sleepers: The MLILY Harmony Chill 3.0 Mattress is a strong choice for side sleepers, especially those who weigh less than 130 pounds. The memory foam and plush polyfoam layers help cushion the shoulders and hips, and they offer contouring to help promote spinal alignment.

The Harmony Chill 3.0’s medium (5) firmness is particularly suitable for side sleepers under 130 pounds, who benefit from cushioning pressure relief. Side sleepers who weigh more than 130 pounds could use a slightly firmer surface to maintain spinal alignment, though these sleepers should feel fairly comfortable on the mattress as well.

Back Sleepers: Back sleepers under 130 pounds receive excellent support from the MLILY Harmony Chill 3.0 Mattress, which contours to the shape of the back for optimal spinal alignment. This mattress also offers decent support for back sleepers between 130 and 230 pounds.

Back sleepers over 230 pounds may need to find a firmer mattress. For these sleepers, the plush foams allow the midsection to sink in further, which can push the spine out of alignment and cause soreness and pain.

Stomach Sleepers: Stomach sleepers tend to need a firmer mattress for consistent spinal support. For stomach sleepers over 130 pounds, the Harmony Chill 3.0 may be too soft. These sleepers may find their abdomen sinks into the mattress, which can lead to back pain.

The MLILY Harmony Chill 3.0 Mattress delivers sufficient support for stomach sleepers under 130 pounds, who don’t sink as far into the mattress.

MLILY Harmony Chill 3.0 Mattress Review Breakdown

The MLILY Harmony Chill 3.0 Mattress includes four layers of foam in the comfort layer and one layer of foam in the support core. A breathable knit cover encases the mattress.

The top layer is made of perforated polyfoam with phase change material (PCM). This material is designed to maintain a neutral temperature by absorbing and releasing body heat as needed.

The next layer of the mattress is made with memory foam, featuring bamboo charcoal infusions engineered to absorb moisture and heat. Memory foam also contours closely to help relieve pressure points.

A third layer of gel-infused polyfoam is intended to draw heat away from the surface of the mattress. The fourth comfort layer is made of convoluted polyfoam, sometimes referred to as egg crate polyfoam. The ridged texture of this foam is designed to increase airflow.

The final layer of the Harmony Chill 3.0 Mattress is a polyfoam support core. This layer gives the bed a sturdy and consistent base. The 13-inch profile is slightly higher than normal but still within the average range. It has a medium (5) firmness.


Medium (5)

Mattress Type



The MLILY Harmony Chill 3.0 Mattress includes four foam comfort layers and a polyfoam support core.

Cover Material:

Knit Cover

Support Core:


Comfort Layer:

Perforated Polyfoam with Phase Change Material

Bamboo Charcoal-Infused Memory Foam

Gel-Infused Polyfoam

Convoluted Polyfoam

Mattress Prices and Sizing

The MLILY Harmony Chill 3.0 Mattress is priced higher than average for a foam mattress. The mattress has five layers and various features designed to improve temperature neutrality, including phase change material, charcoal-infused and gel-infused memory foam. Including these specialty materials puts the mattress in a higher price category than other all-foam models.

At checkout, MLILY also offers the option to pair the mattress with pillows or with an adjustable base. Customers should bear in mind that MLILY does not offer free shipping or a sleep trial.

Sizes Dimensions Height Weight Price
Twin 38″ x 75″ 13″ N/A $2,299
Twin XL 38″ x 80″ 13″ N/A $2,499
Full 54″ x 75″ 13″ N/A $2,999
Queen 60″ x 80″ 13″ N/A $3,499
King 76″ x 80″ 13″ N/A $3,499
California King 72″ x 84″ 13″ N/A $2,990

Scroll L – R for more details

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Use this SleepFoundation.org link for the most current discount on MLILY mattresses

Trial, Warranty, and Shipping Policies


The MLILY Harmony Chill 3.0 is available online through the MLILY website and on Amazon. MLILY products are also sold in brick-and-mortar stores across the U.S. Customers can use the Store Locator function on the MLILY website to find a local retailer.


Products ship via FedEx Ground and generally take 4 to 7 business days to arrive. Customers pay all shipping costs. The MLILY Harmony Chill 3.0 Mattress arrives compressed and vacuum sealed in a box. Customers can unpack the mattress by carefully removing the packaging and letting the mattress decompress. MLILY recommends allowing 24 hours for the mattress to air out and expand before use.

Additional Services

MLILY does not offer White Glove delivery or old mattress removal.

Sleep Trial

MLILY does not provide a sleep trial for the Harmony Chill 3.0. All sales of the mattress are final.


The MLILY Harmony Chill 3.0 Mattress is backed by a 10-year nonprorated warranty. The warranty covers defects in craftsmanship and materials, excluding comfort preferences. Customers can initiate a warranty claim on the MLILY website. Only mattresses ordered directly from MLILY or an authorized MLILY retailer are eligible for warranty coverage.

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