Bonnel Spring Mattress system are the most
traditional type of innerspring mattress. The
Bonnel coil has an hour glass shape (wider at
the bottom and the top than the middle) and
are interconnected with a mesh of metal to
make the spring system.

In many traditional innerspring mattresses
from the 20th century and still some entry
level models today have used the Bonnel
Spring to create durable and supportive
mattresses