Bamboo Insert consists of 6 layers of silky soft bamboo viscose. This is our trimmest insert yet, but no less absorbent! Natural fibers need to be prepped to become absorbent. Small - Birth-14 lbs - Green Stitch - 11.00" long Medium - 11-22lbs - White Stitch - 12.75" long Large - 16-35lbs - Blue Stitch - 13.75" long X-Large - 26-45lbs - Yellow Stitch - 15.25" long Please wash and dry 3-5 times before use. Made in the USA with imported materials