I bought this in a size 2T for my 18 month old thinking he would grow into it.  The first time he wore it he came back soaking wet.  After some investigation, it seems like it's condensation from his hot little body on the inside.  I'm not sure if having a smaller suit that fit him better would help with that.

My little guy likes wearing it and it does the trick to keep him clean and dry.  We haven't had any super muddy days yet, but with Spring right around the corner I'm sure we'll get to put it through it's paces soon.

**Update: After a super muddy late spring, this product got put through its paces and it worked like a dream.  My son would come back COVERED in mud.  He would literally sit and play in the mud puddles and I could hose him off in the backyard, take the Buddy off and he was good to go.  I would recommend getting a "true" size.  They're bigger than normal clothes so that they'll fit over.  If your kid wears a 2T, I'd say buy the 2T, not the 3T.  Happy Mudding!