I hesitated to buy this product because of its price, but I do not regret this purchase. I have really improved in quality of sleep. It fits perfectly to the mattress of the same brand (and others, most likely), and is ideal for sleeping on the side, or even on the back. Warning: initially it seemed a bit high, even for size M (though I do not have a small frame), but in a week or two he softened and lightly packed, suddenly it works well . Do not hesitate to go still try several bedding store sizes (where it is more expensive ...) Furthermore, the dimensions are not standard, even if the traditional square pillowcases work much, it may be wise to switch to rectangular pillowcases dimension German / Anglo-Saxon.