This pillow I have done me along with a Tempur Cloud mattress. I have regretted it both issues at all. I sleep since use of these products in the truest sense of the word on air. The pillow adapts to facial features to optimally and is for side sleepers the perfect pillow. I would again at any time buy. Size S is ideal for me. Think men should opt for M because it is taller and wider. An extra cover is not required because this velvety effect of the cover is just perfect and can be washed.