probably best matres at ikea made only from natural materials nebver used ,priced at 400 at ikea a bargin for 200 I can also deliver in Berlin
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here is what ikea says about it
Natural materials like natural latex, coconut fiber, cotton and wool provides extra comfort and gives a very pleasant sleeping environment with an even temperature.
The textiles closest to your skin are made of 100% cotton from sustainable sources.
You get support in the right places with the help of two layers of individually wrapped pocket springs that work independently and closely follow your body.
5 comfort zones give very precise support and relieve pressure on your shoulders and hips.
You can sit comfortably on the edge of your bed. The mattress will stay firm and even thanks to the reinforced mattress edge.
Stretch fabric follows the contours of your body as you move in bed.
The distinctive texture on the sides of the mattress comes from the natural, non-coloured and non-bleached linen that creates subtle variations in the surface.
The mattress provides good ventilation and sleeping comfort because the bottom layer is made of natural coconut fibres that allow air to circulate.
Designed to be used on one side only – no need to turn.