We got these cute trainers from BumUnders within a week of placing our order - one of the faster shipping times. I ordered a "size 2" in a zoo print. A variety of sizes and prints are available, as well as custom orders.
Materials: These are a cute print outside, velour inside, and a hidden layer of PUL through the wet zone. I love how soft the velour is!
Closures: I wish they had snaps - again, we're just getting started, and if your kiddo is pretty good about pooping in the potty, it might not be a big deal for you. The elastic seems to be nicely stretchy without too much bulk.
Sizing: We ordered size 2. Sizing claims size 1 is for infants and skinny toddlers, size 2 fits 2-4T, and size 3 first 4-6T.
Acorn is about 29 lbs, and mostly wears size 2T clothes - he can wear most 18 month pants, but they're too short, and he can wear 3Ts but they're too long.
These are a really nice size - underwear sized, sitting low on the hips. I am not convinced they'll fit all the way to 4T, but I guess we'll find out.
Absorbency: In my standard 2 oz liquid test, the first little bit puddled in the velour, but once it started soaking in, all the rest of it soaked right in too. This trainer definitely won't hold much more than one pee though, so keep that in mind.
Drying: These have never come out of the dryer still damp.
Final thoughts: These are really cute, and cut more like underwear than some others. They'd be great under pants, but not so great if you're still missing a lot of poops. They're super super soft inside too.
Disclaimer: these trainers were bought by me, and this review is my personal opinion of them. No compensation was provided.