Wooley Friends Flannel Fitted Crib Sheet (Animals). Add some prehistoric fun to your nursery with Trend Lab’s Wooley Friends Print Deluxe Flannel Crib Sheet. Our Wooley Friends Deluxe Flannel Crib Sheet features prehistoric friends including Woolly Mammoths, Sabretooth Tigers, and Rhinos. Features a Wooley Mammoth and friends print 100% Cotton Deluxe Flannel Fits standard crib mattress 28 in x 52 in Machine wash cold with like colors, gentle cycle. Do not bleach. Tumble dry low or line dry. Do not iron. Do not dry clean.