Lull Vs. Casper Mattress Comparison

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The Lull and Casper are both all-foam mattresses that, at first glance, appear to be quite similar. However, if we look more closely at them, there are some clear differences.

To assist you in making the choice between these two mattresses, I have broken them down based on construction, firmness, and feel. Read on to see which mattress will be the best fit for you.

Key Similarities

  • They are both all-foam mattresses.
  • They both incorporate memory foam into their construction.
  • Both mattresses are the same height at 10” tall.
  • They have similar customer service terms. Both have free shipping and a 100-night Sleep Trial.

Click HERE for $50 off the Lull mattress.

Key Differences

  • The Lull is currently around $200 cheaper than the Casper.
  • The Lull is firmer than the Casper.
  • The Casper has more layers than the Lull and has a construction that emphasizes zoned support.
  • The Lull has a classic memory foam feel, while the Casper has a balanced foam feel.

Click HERE to get the highest available discount on Casper.

A mattress is cut open to show its design.

Lull Construction

  • The Lull is 10” tall.
  • The cover of this mattress is soft and thin.
  • The first layer is 1.5” of a gel memory foam. This soft material has that classic, sinking memory foam feeling.
  • Then, 1.5” of polyfoam transitions you from the comfort layers to the firmer support layers.
  • The final layer is 7” of base support foam.

Read our full Lull Mattress Review HERE.

The inner construction of a mattress.

Casper Construction

  • The Casper is 10” tall.
  • It has a soft, thin cover that allows you to interact with the soft upper layers of the mattress.
  • The first layer of the Casper is 1.5” of a latex-like foam.
  • Below this is 1.5” of memory foam. This has that slow sinking feel to it. It also helps with pressure relief.
  • The next layer is 1.5” of a zoned transition foam. This moves you from the soft upper layers to the support layers beneath.
  • The base layer is 5” of a durable support foam.

Read our full Casper Mattress Review HERE.

Construction Differences/Notes

  • While both mattresses have memory foam, the Lull has this memory foam on top. Because of this, you have more of that slow, sinking-in feeling with the Lull.
  • It is easier to move around on the Casper because the memory foam is actually in the second layer. The top layer of latex-like foam is fast to respond, so you don’t get stuck.”
  • The Lull has fewer layers than the Casper.
  • The Lull does not have a transition layer, while the Casper does.
  • Both mattresses have thin, soft covers.
  • The Casper has zoned support, while the Lull does not. The zoned support helps the heavier parts of your body feel supported while keeping the rest of the mattress soft for good pressure relief.

Firmness/Feel Differences

For me, the Casper was the softer of the two mattresses. The Lull felt like a 7 out of 10 on a firmness scale, and the Casper felt like a 6 out of 10. The Lull has a soft top layer but a firm layer right beneath that. This adds a bit of firmness to the mattress overall. The two top layers of the Casper are both quite soft, so it has a softer feel overall. They both relieved pressure well when I was on my side. However, because it’s a softer mattress, the Casper felt a bit better in this position.

The Casper has a more balanced foam feel, while the Lull has that classic memory foam feel. Lying on the Lull, you sink into the memory foam. On the Casper, the foam layers react more quickly, so it is easier to move around on the mattress.

Watch the two videos below to see the firmness and feel differences between the Lull and Casper.

See how easy it is to move around on the Casper mattress. It is responsive, so you shouldn’t be getting stuck in this mattress.

Motion Isolation Differences

While both mattresses isolated motion well, the Lull handled it a bit better. I believe this is because the memory foam layer is on top of this mattress. The videos below show the differences between the motion isolation of these two mattresses.

The Casper does a very good job of cutting down on motion transfer. You shouldn’t feel your partner’s movements on your side of the bed.

Edge Support Differences

Being that these are both all-foam mattresses, I expected them to collapse as I sat near the edge. This did happen, but I did not feel like I was going to fall off of either the Lull or the Casper. However, I felt a little more secure while lying down near the edge of the Casper. You can see the edge support of the Lull and Casper in the photos below.

A man sits near the edge of the bed.

A man sits near the edge of the bed.

Marten’s Take

Marten is a staff writer for us. He has a much different body type than me: He is 6’7″ and weighs about 230 lb; I am 5’9″ and 160 lb. Here is what he thought about these mattresses:

With the Casper, Joe thought it was a 6/10 in terms of firmness. I thought it was a 7/10 in terms of firmness. With the Lull, Joe thought it was a 7/10, and I thought it was an 8.

Considering that, if you’re my size and a side sleeper, I would maybe choose the Casper as it’s the softer of the two mattresses. If you’re my size and a back or stomach sleeper, I would maybe consider the Lull.

While our numbers were different, Marten and I agreed that the Casper is the softer of the two mattresses. Because of this, the Casper was a better fit when he was on his side. Being a heavier person, he may have pressed through the soft memory foam layer on Lull and felt that firmer layer beneath.

Pick The Lull If …

  • You prefer a firmer mattress. While it is still somewhat average in terms of firmness, the Lull is definitely firmer than the Casper. If you sleep primarily on your stomach, this might be a good choice for you.
  • You like the classic memory foam feel. With the Lull, you get that slow sinking-in feeling that comes with memory foam. If you like that slow compression, you may prefer the Lull.
  • You want a less expensive mattress. The two mattresses are similar in a lot of ways, but you will save money if you go with the Lull. If money is an issue, this could be a good pick.

Pick The Casper If …

  • You prefer a softer mattress. This mattress is the softer option of the two mattresses. If you sleep primarily on your side, this could be the better pick for you.
  • You are a combination sleeper. Casper’s proprietary zoned construction keeps the mattress supportive under the heavier parts of your body and offers pressure relief in other areas. This means it could be a good match for you in numerous sleeping positions.
  • You want a balanced foam feel. The Casper has a bit of bounce, while the Lull does not. The foam is more responsive and, because of this, it is easy to move around on the mattress without feeling “stuck.”

RELATED: Best Mattresses For Side Sleepers


The Lull and Casper both have a lot to offer depending on your sleeping style. They are somewhat close in terms of firmness, but their constructions make them ideal for different types of sleepers. Please leave any specific comments or questions about the Lull or the Casper in the comment section below.

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Gravatar for Joe Auer

Joe Auer

Joe Auer is the editor of Mattress Clarity. He mainly focuses on mattress reviews and oversees the content across the site.

He likes things simple and take a straightforward, objective approach to his reviews. Joe has personally tested nearly 250 mattresses and always recommends people do their research before buying a new bed. He has been testing mattresses for over 5 years now, so he knows a thing or two when it comes to mattress selection. He has been cited as an authority in the industry by a number of large publications.

Joe has an undergraduate degree from Wake Forest University and an MBA from Columbia University.