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The coating itself is mE always useful, but like here on several occasions complained a bit tight. I use it on a 180X200X15 cm mattress and have him, after I had read the reviews here, deliberately not washed before use. I'd say he's more 190x190 (before potential shrinkage).
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The enclosing reference does not move with me and the cover over the mattress has also worked very well, so I would highly recommend this product. In my case, the coating is designed as a pure mattress protectors (and not incontinence related) and from which I am very satisfied. I notice it under the fitted sheet and barely even though I count more on the human heaters in bed, I'm sweating a bit. As for the "chink", so unfortunately I can not comment because I have a mattress in bed size (which I for over 10 years and just can recommend again :))