Blueberry Capri Size One-Size with snap closure is a diaper cover with stay-put flaps. Made in USA. One-Size fits most: 12 - 35 lbs Waist: 15-23 inches, Thighs: 6-13.5", Rise: 15-19" See it on a baby. Fully encased leg elastics with binding all the way around. A long-time overnight (or daytime) favorite. While it may look similar to many one-size covers, it really is superior. This one is not leaky because of the shape and the high quality of the fabric. We have nothing else like this. It's in a category of its own. Somehow, this cover has the best overnight-leak-free reports of any non-wool cover that we've ever had in our 26 years in business. That's not a small thing to say. This One-Size cover runs quite large. It can work but it is quite big on a 12 pound baby. It fits well beginning at around 4 or 5 months old or 14+ pounds at the smallest rise setting. It may fit to 40 pounds at the largest setting. The cover is designed for both tucking a diaper under the front and back flap or using it over a fitted diaper. The flap is nice to help hold a trifolded diaper in place and it also keeps the PUL away from baby since the knit fabric is there on the flaps. But just because it has flaps doesn't mean you have to use them. As a matter of fact, pinning or spreading out the cotton inside does give better coverage, but if you like trifolding and using the flaps - go for it. The shape is roomy enough to use this over fitted diapers or fastened diapers of any kind. In a way, having the flaps there is the best of both worlds. The part of the inside of the cover that is most likely to touch baby's skin is where the flap is, so that's nice. Yet since it doesn't have that fabric in the wet zone, it doesn't pick up odors so you can often re-use the same cover through multiple diaper changes. It's one-size fits most adjustable - like many around, but the shape of each brand or kind are different (well, for the many names of some imported ones, they are pretty much the same, but for the USA-made ones, each brand really is a unique shape and design). This cover is more roomy inside than Smart Bottoms Too Smart and overall it is slightly larger. It's nice to have options to choose what style, shape and fit are best for you. The roomier-inside fit is really nice for adding extra absorbency for naps and nighttime, or for anytime. The leg won't "pull away" because there is enough room to cover the doublers or whatever extra absorbency you add for overnight. See the inside of the cover. 100% polyester. These are high quality covers and are made in USA.