YOU NEED:
 2mm crochet hook;
 100% cotton yarn skein of 50grams/240m or 1,76 Oz/262yards (for example I used Vita Coco cotton)
Only 1 skein of yarn is needed for an adult cap having measurements of the head 21-22 inches (55-58cm) in circumference and the 5-6 inches (15-16 cm) long.