Silk, as one of the natural fibres, is very friendly to the skin. It helps to decrease the skin's loss of moisture and is better tolerated than other fabrics by people with sensitive skin.
Correct care will help your silk fitted sheet last for years. The part which rubs against your heels will pill easily because foots' skin is rougher after every-day walking. We advise you to cover that part with a towel to prevent the pilling issue.