According to King Koil, the "Extended Life mattresses are built for indestructible comfort." Terms used in describing this line of innerspring mattresses include "heavy-duty" and "extra-strength." King Koil says these mattresses and foundations "are built to last."
King Koil lists eight models in the 2015 edition of the Extended Life brand. In order of price, they are Extended Life 150, Extended Life 3000, Extended Life 250, Extended Life 3100, Extended Life 350, Extended Life 3200, Extended Life 450, and Extended Life 3300. With id's of 3 and 4 (on the King Koil scale of 1-5), these models' comfort levels range from Extra Firm to Medium Firm.
The modified offset coils in Extended Life mattresses are made of 12½ gauge wire, definitely heavier than most coils on the market. Called the eXtended Life Performance System by King Koil, these are Hinge-Flex™ coils, made by Leggett & Platt, a major supplier of mattress support system components. The heavy-gauge springs account for the low coil count (368). According to King Koil, these are shaped to also be responsive to lightweight persons.
King Koil encircles the innerspring with Excellent Edge FE, a heavy-duty foam encasement. This is edge support for the sleeping surface to keep the edge from sagging. According to King Koil, this increases the "usable sleeping surface" by 10%.
The concept, design and name of the King Koil Extended Life brand address concerns of consumers over the durablility and longevity of mattresses and beds. A cursory survey of mattress reviews in general reveals depressions and breakdown of mattresses as common complaints.
King Koil uses heavier-than-usual foams in the comfort layers of Extended Life mattresses, including its memory foam, polyurethane and latex. In the top layers, cutouts in the foam compensate for heavier construction to counter heat buildup.
The cover fabrics of Extended Life mattresses by King Koil include Hydra Performa fibers. These wick moisture away to keep the sleeping surface dry. This counters a clammy feel which would interfere with quality sleep.
King Koil supplies its Superior Foundation for use with the Extended Life models. This is a sturdier version of regular wood-framed bases, with 2½ times as many slats and twice the beams. The heavier foundation protects the mattress from breaking down. Covered with fabric, it matches or complements the mattress.
King Koil underscores the stated longevity of mattresses under its Extended Life brand by issuing a 25-year warranty with the the first 15 years not prorated. It usually takes several months for new mattress models to appear at retailers while previous models are being sold down. Already, some of the newer Extended Life models are joining older ones at retailers across the country, indicating consumer interest in this line.
King Koil Extended Life Brand (2015)
King Koil, 7501 South Quincy St. Suite 130, Willowbrook, IL 60527, USA, 1-800-525-8331
Heavy duty 12.5-ga offset coils, HD foam comfort layers. Top models have a removable pillowtop
Knit? with Hydra Performa to wick moisture
11 to 15 inches
Heavy wood frame with 16 slats and extra beams
25-Year Warranty, 15 non-prorated
Keep in sanitary condition, and provide proper foundation