King Koil eXtended Life XL 300 II


The No Sag Mattress
The XL or eXtended Life Mattress Collection has been specifically designed to meet the needs of plus-size sleepers. Many plus-size sleepers find that their mattress is uncomfortable, unsupportive and that it tends to wear out quicker. The XL Collection alleviates these common problems with thoughtful engineering to provide a comfortable feel, enhanced support and increased durability. As proof of the XL Collection's quality, it even comes with a 15-year warranty against defects.

Bottom Line Is this a good bed for you?

Fit: Recommended for people who...

Prefer to sleep on their side
Prefer to sleep on their back
Prefer to sleep on their stomach
Prefer medium softness

Function: Rated for its...

Motion Isolation
Pressure Relief

Features: Contains...

  • Innerspring
  • Latex
  • Memory Foam
See specs for the XL 300 II »

Reviews XL 300 II

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Q&A XL 300 II

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Model Features XL 300 II

Support Core:
Comfort Level:
Surface Type:
Tight Top


Mattress Components:
Special Characteristics:
Designed to help with:


Overall Build
  • No-Flip
  • Mattress Thickness: 12.5"

About this Model XL 300 II

Active (edit this)
King Koil
eXtended Life (XL)
Model Name:
XL 300 II

Additional Information XL 300 II


The XL 300 II is a tight top spring core medium mattress model that is part of the eXtended Life product line manufactured by King Koil (Comfort Solutions).


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