Envelope sheets with stitched corners drawn on the bed mattress. Envelope sheets are sewn like an envelope and do not have elastic. From Värnamo of Sweden. Fits bed mattress that is 3-7 cm. The envelope sheets are available on slightly thicker mattresses, up to a maximum of 9 cm. Beware of the seams when the sheet is pulled. Envelope sheets are great for anyone who is moving in bed and who wants the sheets to lie in place. The bed always looks freshly made. 819670 Envelope sheet 90 x 210 percale white, Värnamo of Sweden. Material: 100% percale cotton. The percale sheets are made of fine combed cotton which gives a nice and luxurious feel. Wash at 60 degrees. Dimensions: 90 x 210 cm. Color: White.