Our fitted sheets are one hundred percent cotton and have a depth of 40 cm to fit most mattresses. The top edge of the wall is sewn not gathered like other fitted sheets so they fit snuggly and do not move on the bed. For very deep pillow top mattresses deeper sizes are available on request. The soft, white fabric has the same thread count, six hundred, as does the rest of our range. It is cool and absorbent in summer and fresh and comfortable in winter.They are made in Vietnam by the same company that is part of the ethical work programme promoting traditional skills in outlying villages.