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You hold the world
in your hand.
We believe you can
while still taking care of
the world you hold
in your hand.
So go ahead...
Chill out naturally.
COZYPURE NATURAL LATEX RUBBER
Our most popular mattress! Our CozyPure natural latex rubber mattresses create an ideal sleep system that reacts to your body with dynamic distribution of weight. They feature instant-recovery bounce-back, and offer superior support where you need it, while gently yeilding softness to other areas of the body. Our CozyPure natural latex does not have harmful chemicals, it's moisture regulating so you won't "sleep hot", the surface comfort provides proper spinal alignment yet delivers the perfect balance of pressure-point relief... and it's environmentally-safe. No wonder it's our customers favorite mattress choice!
Quality and testing - Physical tests The fundamental question is which tests are and which are not relevant to the comfort of a mattress core, i.e. to the body support and the durability. Tensile strength and elongation under conditions of breaking are of no relevance, as a mattress core under circumstances of normal use is merely loaded by pressure and not by tearing.
Hardness The hardness is the resistance against pressure. The hardness and the density (mass per unit volume) of a latex rubber foam mattress core are interrelated. As the density decreases, a growing loss in hardness arises after repeated loading.
1 The compression set is determined by ISO 1856 by compressing a foam sample 75% during 22 hours under a temperature of 70°C and then calculate the loss in height in terms of percentage. Good foams lose height less then 15%. A more relevant test however is the dynamic fatigue test. This test, according to ISO 3385 standard, loads a foam sample of 40 by 40 cm 80 000 times with a weight of 75 kg (a force of 750 N). Afterwards, the loss in height and in hardness is determined in terms of percentage compared to the original value.
Another dynamic fatigue test is done according to the testing method of EN 1957 (ecolabel directive 98/634/EG). In this test, a roller-shear with predetermined dimensions and a weight of 140 kg is rolled 30 000 times up and down the mattress. Afterwards the thickness and the hardness after 100 cycles are compared to the end results. The hardness is determined as the average incline at 210 N, 275 N and 340 N in the load deformation curve. Tests run by the German Institute LGA in 1997 following the project EN 1957 gave results of about 3 mm loss in thickness and 3 % loss in hardness for a latex mattress core.
The hysteresis is calculated by dividing the surface between load and de-load curve by the load surface. (expressed in %). The hysteresis indicates the amount of energy that is absorbed by a latex core during loading / de-loading. The higher the absorption of energy by a mattress , the more muscle strength (energy) the person asleep will need to change its position and the lower the quality of his sleep. Mattress cores which are too hard however have a too low hysteresis, which results in no energy being absorbed by the mattress and the person sleeping 'above' the mattress. This also excludes a stable body position. A ideal hysteresis lies between 20 and 30% when the hardness is comfortable.The LGA-test mentioned earlier gave a hysteresis of 20,3% with a hardness of 6,83N/mm according to EN 1957.For more information about our natural mattresses and bedding, please call the Organic Comfort Zone at 1.800.229.7571 Monday-Friday 9am-5pm EST, or visit the CozyPure Organic Mattresses & Bedding website. To make a purchase, visit our online retailer.
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