Ace of Hearts Sand Dune Sleeping Bag closes with little snaps on the shoulder straps and a hidden zipper that is safely covered with fabric. The Ace of Hearts is not made of our signature crisp cotton, but of high quality 200 TC organic percale cotton. Percale sheets are cotton sheets known for their signature tight weave. The word “percale” refers to the specific type of weave used to produce the sheet and not the material it's made from. See sizing for more information. Details: 100% Organic Percale Cotton 200 TC Colour: Sand Dune with chocolate brown coloured, embroidered hearts.