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Sizing can be different from one manufacturer to another but will usually fall into one of the following categories.

One Size

One size diaper systems provide a customizable fit from “birth to potty”.  One size diapers offer 3 to 4 rows of adjustable rise snaps to adjust as your baby grows.  In an effort to maximize the affordability of cloth diapering your baby, Thirsties One Size Pocket Diaper and One Size All In One are designed to fit most babies from 8-40 lbs. Weight ranges for one size diaper systems do vary between manufacturers.

Two Size

Two size diaper systems are designed to effectively diaper your baby from birth to potty in two sizes. Thirsties created its own Duo line of products to ensure an amazing secure customizable fit for babies of all sizes. Our size one is designed to fit babies between 6-18 lbs and size two is designed to fit babies from 18-40 lbs. Each of the two sizes in the Thirsties Duo Line features three rows of snaps to adjust the rise to your baby’s size and shape; it is like having three sizes in one.


Sized diaper systems offer a specialized fit for your baby, but each size covers a narrower range than that of a Duo or One size system. Thirsties Diaper Covers are part of our sized system and are available in four sizes; x-small, small, medium, and large.


Hook and Loop Closures

Hook and loop closures make diaper changes quick and provide an amazingly snug fit. Although hook and loop closures are the most convenient closure option, they tend to have a shorter lifespan than snaps. Thirsties hook and loop is often regarded as the strongest and most durable on the market.

Snap Closures

Snaps are easy to use, are more durable than hook and loop and are strong deterrents to toddlers who prefer to be diaper-free. Snaps are also used throughout the Duo line and One Size Pocket on the adjustable rise.


Gussets are a crescent-shaped inserts added to the leg openings of many cloth diapers for added performance and expansion. Thirsties signature leg gussets move with your baby, providing advanced protection against leaks.



No stuffy plastic or rubber pants! PUL provides a very reliable, pliable, and breathable yet waterproof outer layer for Thirsties’ covers, wraps, and diapers. PUL stands for polyurethane laminate and is made from extremely durable polyester knit to keep your baby and his or her clothes dry.


A soft, napped wool-like fabric made from synthetic fibers. Microfleece fabric does not absorb, but rather allows moisture to pass right through, which is why it is often used as the layer closest to your baby’s skin. The microfleece layer provide a ‘stay-dry’ effect for your baby’s comfort. Microfleece can help to reduce diaper rash, resists staining, and is buttery soft to the touch.

Hemp Jersey

Hemp jersey is as soft as your favorite t-shirt but is more durable than pure cotton of the same weight and absorbs 25% more moisture! By using hemp, you are able to gain a substantial amount of absorbency without adding a tremendous amount of bulk to your diapering system. Thirsties hemp jersey is one of the softest and most durable available in the market. It is used in Thirsties prefolds and inserts.

Microfiber Terry

Our synthetic microfiber terry is used throughout our line as a soaker due to its performance characteristics of being highly absorbent and quick drying.

Organic Cotton

Organic cotton is soft to the touch, absorbent, and chemical free, making it an excellent choice for babies with allergies or sensitive skin. You will find organic cotton in the body of Thirsties Natural One Size all in one and Natural Newborn all in one Diapers as well as our Organic Cloth Wipes and Organic Cotton Doublers.

Bamboo Cotton

Our bamboo cotton is irresistibly soft, naturally organic and ultra-absorbent, able to hold 3 times its weight in water. This porous fiber is breathable and wicks moisture away from baby’s skin, leaving baby cool and dry. Bamboo cotton is used on Thirsties
Natural One Size Fitted Diaper and our Natural Newborn Fitted Diaper.