NEW Pottery Barn Kids Aria Butterfly Organic QUEEN Sheet Set Multicolor NWT. Description from Pottery Barn Kids. They’ll fly right into sweet dreams with the Aria Butterfly sheet set and pillowcases. Made of 100% cotton percale, they’ll be comfy and cozy all night long. Made of 100% organic cotton percale. Certified to GOTS (Global Organic Textile Standards): This product meets the gold standard of textile production – it exceeds organic fiber requirements, contains no restricted chemicals and meets strict social responsibility standards. Pottery Barn Kids exclusive. Fitted sheet has universal elastic (elastic around the entire edge) for a snug, secure fit.