Sleep Number P-5 VS. C-4: Which One Is Right For You?

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With so many Sleep Number beds to choose from, it can be hard to know which one is best. We’ve picked two popular models: the P-5 from the Performance Series and the C-4 from the Classic Series, and put them head to head to help people decide which mattress might be right for them.

Key Similarities

  • DualAir™ adjustability
  • Available in a variety of sizes – including Split King and FlexTop King
  • Individual or dual air chamber options

Both come with these optional features:
SleepIQ® technology
FlexFit™ Adjustable Bases

Key Differences


  • 11” mattress profile
  • European style pillowtop design
  • 2” of proprietary PlushFit foam
  • Mattress fabric is made with a rayon/polypropelene blend for smoothness and durability
  • 5 zones specifically designed to contour to the head/neck, shoulders, lower back, hips, and feet
  • $2,099.99 for a Queen




  • 10” mattress profile
  • Firmer mattress top (soft knit but not pillowtop)
  • 1½” foam comfort layer
  • Mattress fabric is made with a polyester/polypropelene knit blend
  • Foam has 3 zones specifically designed to contour to the head and neck, back and hips
  • $1,599.99 for a Queen

What I Found From Several Live Chat Sessions

After speaking with Sleep Number Customer Service representatives, I learned about a few extra details and clarifications that may help people decide between a P-5 or a C-4 mattress.

  • Mattress Top: Customer service representatives told me that the C-4 has a soft knit mattress top, while the P-5 cover is a more luxurious, pillowtop style.
  • Comfort Foam Layer: Customer service representatives told me that the C-4 has a 1.5″ foam comfort layer but the P-5 has a 2″ foam layer of their proprietary PlushFit foam which is a bit denser and supportive.
  • Popularity: The P-5 model is Sleep Number’s most popular bed. The salesperson I spoke to at a sleep number store said it had a good amount of balance between cushion and natural firmness from the air chambers.

Jump to the full Sleep Number review

Which Should People Pick?

P-5 if…

  • People Want a Balanced Bed: The P-5 is popular because customers feel it is the right balance of firmness and cushion. Consumers get 2” of PlushFit foam in the P-5, which is more dense and supportive than the foam used in the C-4.
  • People Like A Mattress With A Pillowtop: The P-5 comes with a more luxurious European-style pillowtop mattress, while the C-4 offers a soft – but flatter – mattress top.

Read our full Sleep Number P-5 review

C-4 if…

  • People Like A Firmer Bed: Between the two mattresses, the C-4 features less cushioning and a less dense comfort layer. With less supportive material between the air chamber(s) and the mattress top, the C-4 will be a naturally firmer bed all around.
  • People Are On A Budget But Want Extras: There is a $500 difference between the C-4 and the P-5. While there are many reasons to upgrade to the P-5, saving on the mattress price would allow people to spend money on options like the popular SleepIQ® technology or FlexFit™ Adjustable Bases.

Read our full Sleep Number C-4 review

Personal Opinion

I consider myself to a be a budget-conscious person and while I would naturally lean towards the more affordable mattress (C-4), I think the P-5 may just be worth the extra money for the enhanced construction and details it offers.

For an extra $500 people are essentially getting a taller mattress with a more luxurious and softer pillow top cover, as well as a denser, more supportive, and thicker foam comfort layer. The foam layer in the P-5 also offers two more areas of pressure relief than the C-4

What tips the scales to the P-5 for me is that it’s a best seller. If it’s known for being a good balance of firmness and cushion, and so many people love it, then I think I would, too.

Gravatar for Katie Golde

Katie Golde

Katie manages the day to day operations of the Mattress Clarity news site and reviews sleep products in addition to writing and editing sleep news. She hails from Austin, where she lives with her growing family. She is a Certified Sleep Science Coach and has a master’s degree in Journalism from Northwestern University and has a background in health and science content. Her work can be found in print and online publications like Discover Magazine, USA Today and The Huffington Post.