The phrase "mattress levels" typically refers to the different firmness options or settings available in a mattress. It suggests that a mattress can be adjusted or customized to various levels of firmness according to individual preferences.
Sentences with «mattress levels»
What's nice about this crib is that it's convertible; it has 4 adjustable mattress levels and can also convert to a toddler bed! (momtricks.com)
This co - sleeper / bassinet has two mattress level settings to accommodate your baby as he or she grows. (get-your-baby-to-sleep.com)
Customers liked the simple design and that it could be adjusted to 4 different mattress levels. (whatbabyneedslist.com)