The Rumparooz 6R Soaker was designed specifically for the Rumparooz One Size Cloth Diaper, but has such a complete range of size and absorbency customization it can be used in any pocket diaper in your cloth diaper stash. Each Rumparooz 6R soaker is actually a pair of inserts, one contoured newborn insert with two snaps (3 layers thick) and one one-size insert with various snap settings (4 layers thick). The Rumparooz 6R soaker is the first one size insert that lets you fully customize both size and absorbency with 6 different settings. Inserts that are made from natural fibers must be fully prepped before use. The Hemp & Rayon from Bamboo inserts will be at their maximum absorbency after 8-10 Hot Wash/Tumble Dry High, however they may be used before they are fully prepped. To prep soakers, wash on hot (no detergent) then tumble dry on high 3-5 times.