Yes, Layla mattresses contain fiberglass. The company uses Ventex fire-blocking sleeves made of fiberglass particles and polyester.
Here’s some additional info straight from the Layla Sleep customer service chat. This answer was given in response to the question, “Does the Layla mattress contain fiberglass?”
Manufacturers commonly use fiberglass as a flame retardant. It is affordable and effective, but it may pose health risks if it leaks outside of the mattress cover.
TIP: Check out this table to see which mattresses contain fiberglass and which ones use a natural fire barrier.
