Heavy duty rug crochet with old Tee Shirts picked up at second hand store. the larger the Tee Shirt the longer the strip. Start at the bottom of Tee shirt and cut round and round until you reach top of tee. then stretch the tee shirt strip. It will curl up makes strong yarn. connect one piece to another by overlapping by 3-4 inches, follow any crochet pattern. It took me 4 days to complete this project about 4' from center to end, took about 47 old tee shirts.