The exact name for this diaper should be a contour diaper. I think it's already discontinue and the most similar to it will be Imse Vimse One Size Terry Contour Diaper with 100% organic cotton. The one I have is made of cotton terry, so the fabric feels like the bath towel! *grin*
Basically it's a day time nappy, slightly more absorbent that napkin. If I need to compare it with a fitted diaper which I used on my babies, I would say the absorbency will be equal to SnuggleHugz sherpa fitted.
No smell retain even you rinse a few time with water only. Somtimes, I feel like washing a towel instead... haha! Truely cloth!!!
It doesn't come with any snap or velcro. Some says this is a nippa style... well, not quite sure this is the correct word for this type of nappy. Correct me if I'm wrong. Elastic is not that good I would say as I have loose leg casing after a few months use with my DD. Luckily the design is one size and the thigh area still snug if you use a snappi to secure the diaper on baby. Fit my DD till 26 months old and I started to use on my DS when he's just 4 months old.
As for smaller baby, you just need to fold down the front to desire length and snappi at the front. Just as shown in the picture below.