The hook and loop version is on this page. The snap version is here.
Don't confuse this sized cover with the Duo Wrap. The Thirsties Cover does NOT have snap rise adjustments. This is a true sized cover which comes in sizes Newborn/Preemie through Large.
When Thirsties Duo Wrap size 2 is getting too small on your toddler, the size Large cover is the next size up. Large is bigger than Duo size 2 but smaller than Duo size 3. It has room enough inside for a nighttime diaper.
The Newborn-preemie size is suitable for preemies or for those who want something tiny and not bulky that truly fits your brand new full term baby for the couple of weeks. Use this over a Preemie, Newbie or Newborn prefold (but not over Newborn Workhorse since this cover is tiny).
The XS size is good over Prefolds and Workhorse size Newborn and Small or for skipping newborn size diapers and starting in Small or Novice size prefolds. Understand that this combinations would be big at first but it can be workable and newborn babies do grow quickly.
Size Small fits over the size Medium Workhorse and size medium fits over the size Large Workhorse, generally. Don't go by just the size name (such as "small") but instead pay attention to the weight ranges because the size names vary from product to product. When planning your diaper stash, remember that paper and pen notes still work very well to help you figure things out.
There are no rise snaps on this cover.
The tiny Newborn/Preemie size is only available in the hook and loop closure version. In the picture the medium is not spread out well and it is really bigger than this picture makes it look. See the same diaper in SNAP VERSION.
Thirsties Diaper Cover is a simple wrap-style cover with leg gussets. It is an exposed laminate cover which is also referred to as a "wipe-clean" interior. The PUL (waterproofing) is exposed on the inside for a more slick, wipe-clean surface. Simple and effective. 100% polyester with TPU laminate. FREE of VOCs, PVC, phthalates, lead, and latex. Made in the USA.
Preemie/Newborn is for tiny newborns. Oak and Acorn limited edition print pictured has sold out but this picture still shows this tiny size nicely. In size Large, this is one of the few covers that fits really well over the XL Workhorse or XL Prefolds. Actually having a cover that fits correctly is important in both the small and large sizes. Most adjustable covers are really adjustable "mediums" and don't fit well on newborns or bigger toddlers.