Aristocrats Wool Soakers are wonderful for night time diapering. For a dry bed they're hard to beat. They are much more than just a night diaper cover though. Night and day they provide the comfort and protection your baby needs. Aristocrats wool covers are generously sized and fit well over fitted style cloth diapers as well as prefold diapers when using a diaper fastener. What's more, wool, being completely breathable, maintains normal body temperature - not too hot, not too cold - thereby greatly reducing the risk of diaper rash associated with heat and bacterial growth. For 24 hour protection we recommend 3 to 4 covers rotated and air-dried between uses. Aristocrats wool covers should be washed and lanolized before first use.