We have had this bed for a very long time (15+yrs.). It has just now started a tiny drip at a seam, I'm guessing. It has a 24mil. liner so the small amt. of moisture is trapped in it. After 4 nights from the detection of the leak, after changing sheets, it is still firm & minor amt. of moisture. I have never had a more comfortable bed. The dual sides are adjustable by adding more or less water to the dual chambers yet it has a center soft wall that keeps the two cells separated. It is warm in winter & cool in the hot summer days. There is no bed that is as adjustable for temperature or support. I want to replace it with another Sterling Sleep system. We are considering a Sleep Number Bed due to the air vs water weight & possible leakage issue but I can't imagine sacrificing the comfort.
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