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A cover is the
outermost layer of a nappy and this is what prevents the moisture in the nappy leaking out onto clothes.
A PUL cover, in my opinion, is the best all-round cover available. A PUL cover is normally made of polyester with the inside of the cover having a polyurethane layer sprayed on to laminate the fabric. This makes it waterproof but still very soft any pliable. By laminating the fabric, it gives the wrap a high degree of water resistance without compromising the breathable quality needed for the comfort of your baby.
When cared for properly they will last. Most PUL covers can be washed with the nappies and dry in minutes. They are my favorite for day and night time use.
Fleece and wool both also act as a barrier to prevent leaks because they do not hold water and are generally a fitted wrap with elasticized legs. One issue with wool is it is only made water resistant by the presence of lanolin so wool covers need to be re-lanolised every now and again. This is done by soaking the cover in a diluted lanolin solution.
The only times I would avoid using fleece or wool covers is when a synthetic fitted nappy is being used or if a baby is sitting in the car or pram for extended periods because of the lack of airflow. This will restrict evaporation and could potentially cause leaks as the wool and fleece covers are not technically water proof, they are highly water resistant.
The same cannot be said for wool covers as they cannot be used for two consecutive nappies because the fibers need to 'air'. Most parents tend to alternate between two wool covers throughout the day or just have one wool cover for night time use only.