Do I need to buy this insert separately from the Hero, or does one come with it?
The Hero Undies shell does not come with an insert. Some stores may offer inserts as an add-on, while some places may list inserts separately. We display them like this to give people the option of using inserts they already have at home (and many people have invested a lot of money into expensive inserts already) and to give people the option to choose the fiber they think will work best for them.
Why does the big insert have a number for the size and the small insert have a letter?
Super Undies has had a product called the Step-up Insert available for many years. It is a two-layer microfiber or cotton insert designed to help boost absorbency, so a parent can add more stuffing if the kid is a heavy bed wetter. When we developed the Hero Insert set, we decided to use the inserts already on the market so people can expand their sets as needed. Step-up Inserts are available to purchase separately, but one will come pre-stuffed in your Hero Insert Set. A Step-up Insert can not be used alone with the Hero Undies. It does not provide enough absorbency.
Which insert is the most absorbent, microfiber or bamboo/hemp?
Microfiber absorbs faster, but bamboo/hemp will hold onto the wetness for a longer period, and will eventually hold more. This is why we include a microfiber insert in the core of our bamboo/hemp inserts. For a child who has a very strong fast stream, you will need the fastest soaking power out there. For a child who floods the bed, you will want bamboo/hemp.
What if this insert does not absorb all my child can pee out in one night?
The magic formula for making any cloth overnight product work is to match or beat your child's output capacity with absorbency. Most parents will find the insert that comes with the product is adequate absorbency for what they need, but some will have to seek additional absorbent options. For this reason, you can always get an additional Step-up Insert and add it behind the Hero Insert Set, or even a cotton washcloth! The cost of using disposables every night for years will seem like a weight off your shoulders if you just find that magic output/absorbency ratio for your undies.