The sheet with stitched corners pulled on the bed mattress. Envelope sheets are great for anyone who is moving in bed and who wants the sheets to lie in place. This is excellent when it comes to bunk beds. Better than pull-on sheets with elastic that are not stubborn to store in the linen closet. From Värnamo of Sweden. Envelope sheet 210 x 210 percale. 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: 210 x 210 cm. Sheets are sewn with shrink wrap. Choose the same size as the mattress. Fits bed mattress that is 3-7 cm. Sheets are available on mattresses that are up to 9 cm but then you have to fight a little to get on the sheets and at the same time be careful with the seams. Color: White.