Hemp/Cotton Nighttime Doublers have 5 layers of premium natural fabric made up of 55% hemp and 45% cotton, for maximum absorbancy, and work as a doubler with Buttons daytime insert snapped on top. Buttons cloth inserts snap right into our one-size diapers covers. Plus, they come in 2 sizes for your growing baby (small fits babies 9-20 lbs, large fits babies 20-35 lbs.; Small inserts: dark orange stitching; Large inserts: dark blue stitching.) Note: the nighttime doubler is made to be used with our daytime insert snapped on top. Only the daytime insert has a top layer of soft moisture-wicking fleece to keep baby's skin dry.