Our absorbent fabric weights in gsm (grams per square meter), from heaviest to lightest:
350 gsm Hemp French Terry
340 gsm Hemp Fleece, Microfiber Terry
300 gsm Bamboo Double Loop Terry
280 gsm Bamboo Stretch Fleece, Bamboo Fleece, Bamboo French Terry, Organic Cotton French Terry
260 gsm Bamboo Velour
This is a measure of how heavy a fabric is, NOT how thick it is - Bamboo French Terry is thinner than Bamboo Fleece for instance. This does give a rough absorbency comparison. All work well for cloth diapers.