Hi E.,
As other moms have noted, there are several kinds of cloth training pants that work well for potty training. We sell three different kinds at our store, Diaper Lab in Somerville, and they each work well depending upon where you are in the potty training process.
Imse Vimse cloth trainers are organic cotton but DO have a layer of waterproofing sandwiched in between the cloth layers. These are definitely for later in the process when you just want to catch the occassional accident or for a long car ride.
Bummis trainers are several layers of cotton flannel on the inside and have waterproofing similar to their diaper covers on the outside. These work really well to prevent leaks.
Happy Heiny's makes trainers as well, and these work very similarly to pocket cloth diapers. They are fleece lined on the inside, have a pocket to add an absorbent insert, but have waterproofing on the outside. These also have snaps on both sides to make a poop accident much easier to clean than the Bummis or Imse Vimse brand. Many people find that they like these for the very beginnig of the training process because they can add as much absorbency as needed, or for nights when a toddler is trained during the day but not at night.
The advantage to using cloth training pants over disposable pull ups is that the toddler will feel more wet and be more inclined to potty train.
Good Luck, and feel free to come by the store, call or email if you have any additional questions.
S.
Diaper Lab
201-A Highland Avenue
Somerville, MA 02143
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www.diaperlab.com