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The Brambleberry print brings a cheerful berry-and-vine pattern to the Smart One 4.0, so a diaper change adds a little color to the day. Underneath the fun exterior is a well-thought-out all-in-one built for real, everyday use.
This one-size diaper fits most babies from 10 to 35 pounds and skips the bulk while still handling the job. Everything is sewn in, so there's no stuffing, snapping, or assembling to fuss with. That makes it a friendly pick for caregivers, daycare, and anyone new to cloth.
- Interior of 100% certified organic cotton against baby's skin, with no synthetic stay-dry lining
- Ten absorbent layers, plus an attached insert you can fold to concentrate absorbency where it's needed
- Waterproof, breathable 100% TPU outer and wide, rolled leg elastic to reduce red marks and leaks
Wash warm, dry warm, and skip the bleach and fabric softener.
The Cosmos print brings a dreamy celestial look to the Smart One 4.0, so this all-in-one cloth diaper feels a little special on the changing table. Beyond the print, it's a premium one-size diaper that fits most babies from 10 to 35 pounds and keeps a trim fit without extra bulk.
- Interior of 100% certified organic cotton against baby's skin, with no synthetic stay-dry materials inside
- Ten super absorbent layers, plus an attached insert you can fold to focus absorbency for light or heavier wetters
- Everything sewn in, so there's no stuffing or snapping, and a warm wash and warm dry gets it ready again quickly
- Wide, rolled leg elastic to reduce red marks and help prevent leaks
Wash once or twice before first use to prep the fibers.
The Dirt Life print gives this Smart One 4.0 a playful, outdoorsy look that's easy to reach for on busy change days. Underneath the pattern is a true all-in-one design: everything is sewn in, so there's no stuffing, snapping inserts, or assembly to slow you down.
It's a one-size diaper that fits most babies from 10 to 35 pounds, with wide, rolled leg elastic to cut down on red marks and help prevent leaks. The interior is 100% certified organic cotton against baby's skin, with no synthetic stay-dry layers. Ten absorbent cotton layers and an attached insert that folds let you place absorbency where it's needed, from light to heavy wetters.
- Inner: 100% certified organic cotton; outer: 100% TPU
- Wash warm, dry warm; no bleach or fabric softener
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One Size | 10–35 lbs | 100% Certified Organic Cotton
The Smart One 4.0 is a premium organic cotton all-in-one cloth diaper designed for simplicity, absorbency, and long-term durability. This one-size reusable diaper fits most babies from 10 to 35 pounds and provides reliable leak protection without unnecessary bulk.
With ten absorbent layers of certified organic cotton and an attached insert that folds for customized absorbency, the Smart One 4.0 delivers performance and convenience in one streamlined design.
Why Parents Choose the Smart One 4.0
100% Certified Organic Cotton Interior
The diaper is lined with certified organic cotton, providing a natural fiber layer against baby’s skin. No synthetic stay-dry materials are used inside the diaper.
Ten Layers of Absorbency
Built with ten super absorbent layers, this all-in-one diaper is designed to handle everyday wear while maintaining a trim fit.
Customizable Absorbency
The attached insert can be folded to concentrate absorbency exactly where your baby needs it most, making it suitable for both light and heavier wetters.
True All-in-One Convenience
Everything is sewn in. No stuffing, snapping, or assembling required. Diaper changes are quick and straightforward, making this an ideal option for caregivers, daycare, or cloth diaper beginners.
Faster Dry Time
The unique design allows for efficient washing and drying. Most machines will fully dry the diaper in one warm cycle.
Gentle, Leak-Reducing Fit
Wide, rolled leg elastic helps:
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Reduce red marks
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Improve comfort
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Prevent leaks
Materials
Inner: 100% Certified Organic Cotton
Outer: 100% TPU (waterproof and breathable)
Care Instructions
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Wash 1–2 times before first use to prep the fibers.
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Absorbency will continue to increase with regular washing and drying.
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Wash warm.
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Dry warm.
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Do not use bleach or fabric softener.
Key Benefits of the Smart One 4.0
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Organic cotton cloth diaper
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One-size all-in-one diaper
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Reusable cloth diaper 10–35 lbs
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Ten layers of absorbency
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Trim, low-bulk design
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Quick-dry cloth diaper
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Easy cloth diaper for beginners
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Natural fiber diaper without synthetic lining
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The Grace print gives this Smart One 4.0 a soft, understated look while the diaper itself does all the practical work. It's a one-size all-in-one that fits most babies from 10 to 35 pounds, so the same diaper grows with your little one from the early months onward.
Inside you'll find ten layers of 100% certified organic cotton against baby's skin, with no synthetic stay-dry materials. The attached insert folds to place absorbency where your baby needs it most, handling both light and heavier wetters while keeping a trim fit. The 100% TPU outer is waterproof and breathable, and wide rolled leg elastic helps reduce red marks and prevent leaks.
- Everything is sewn in, so there's no stuffing or assembling
- Wash warm, dry warm; no bleach or fabric softener
The Hazel colourway gives this Smart One 4.0 a warm, muted tone that blends easily with the rest of baby's wardrobe. Underneath the look sits a genuinely simple all-in-one diaper built to make cloth easy.
Everything is sewn in, so there's no stuffing, snapping inserts, or assembly at change time. The one-size design fits most babies from 10 to 35 pounds, and the attached insert folds to place absorbency right where your baby needs it, from light to heavier wetters.
- Ten absorbent layers of certified organic cotton, with a 100% organic cotton interior against skin and no synthetic stay-dry materials
- Waterproof, breathable 100% TPU outer
- Wide, rolled leg elastic to reduce red marks and help prevent leaks
- Trim fit with faster dry time, usually one warm cycle
Wash and dry warm; skip bleach and fabric softener. A great pick for daycare, caregivers, or anyone new to cloth.
The Mermazing print gives this Smart One 4.0 a playful, sea-inspired look while doing the everyday work of a reliable cloth diaper. It's a one-size all-in-one that fits most babies from 10 to 35 pounds, so it grows right along with your little one.
Because everything is sewn in, there's no stuffing or assembling before a change. Just put it on and go, which makes it a friendly choice for daycare, caregivers, and anyone new to cloth.
- Inner: 100% certified organic cotton, with no synthetic stay-dry layer against baby's skin
- Ten absorbent layers plus an attached insert you can fold to target light or heavier wetters
- Outer: 100% TPU, waterproof and breathable, with wide rolled leg elastic to cut down on red marks and leaks
Wash warm and dry warm; skip bleach and fabric softener. Absorbency keeps building with regular washing.
The playful Moo & You print gives this Smart One 4.0 all-in-one cloth diaper a friendly barnyard look, so changes feel a little more fun. It's a true all-in-one: everything is sewn in, so there's no stuffing, snapping together, or assembling. Just put it on, and you're done.
Inside, it's lined with 100% certified organic cotton against baby's skin, with no synthetic stay-dry materials. Ten absorbent cotton layers and an attached insert that folds where you need it handle both light and heavier wetters, and the waterproof, breathable TPU outer keeps things contained. Wide, rolled leg elastic helps reduce red marks and leaks.
- One size, fits roughly 10 to 35 lbs
- Wash and dry warm; no bleach or fabric softener
- Wash 1 to 2 times before first use; absorbency builds over time
The Rad Raptor print brings a playful dinosaur theme to the Smart One 4.0 all-in-one cloth diaper, so changes come with a little personality. This one-size reusable diaper fits most babies from 10 to 35 pounds and adjusts as your little one grows.
Inside, the diaper is lined with 100% certified organic cotton against baby's skin, with no synthetic stay-dry materials used. Ten absorbent layers keep things trim while handling everyday wear, and the attached insert folds so you can concentrate absorbency where a light or heavy wetter needs it. The 100% TPU outer is waterproof and breathable.
- True all-in-one: nothing to stuff, snap, or assemble
- Wide, rolled leg elastic helps reduce red marks and leaks
- Faster dry time in most machines with one warm cycle
Wash and dry warm; skip bleach and fabric softener.
The Safari Adventure print brings a playful animal-themed look to the Smart One 4.0, an organic cotton all-in-one cloth diaper. This one-size design fits most babies from 10 to 35 pounds, so it grows right along with your little one.
Everything is sewn in, which means no stuffing, snapping inserts, or assembly at diaper-change time. The attached insert folds so you can place absorbency exactly where it's needed, and the ten layers handle both light and heavier wetters. Wide, rolled leg elastic helps prevent leaks and red marks.
- Inner: 100% Certified Organic Cotton, with no synthetic stay-dry layer
- Outer: 100% TPU, waterproof and breathable
- Wash warm, dry warm; no bleach or fabric softener
Wash once or twice before first use, and absorbency keeps building with regular laundering.
Smart Bottoms' Cloth Diaper Fleece Liners
Product Description
Recycled polyester fleece liners can be used with any cloth diaper for a stay dry feeling. Fleece is a moisture-wicking material that helps keeps baby's skin dry.
Material Contents
100% Recycled Polyester
Care Instructions
Wash and dry warm. Do not use bleach or fabric softener.
Features
- Comes in packages of 5.
12 x 5 inches
The Swim Diaper in Crabby is Smart Bottoms' reusable swim diaper with two rows of side snaps. Crabby wears its beach humor proudly - moods may vary, containment should not.
It suits pool-rule compliance, beach weeks, and babies who outgrow disposables mid-season. It retains solids rather than liquids, which is exactly what pool rules ask of it.
- Two rows of adjustable side snaps on each side for a custom fit
- Certified UPF 50+ with chlorine-resistant elastic
- Inner: 100% polyester moisture-wicking lining; outer: 88% polyester / 12% spandex
- Sizes 0/6M (8-16 lbs), 6/24M (16-30 lbs), 2/4T (30-50 lbs)
Will it satisfy public pool rules?
It meets requirements for most public pools, and it can be worn over a disposable swim diaper where a facility insists on doubling up.
How do the side snaps work?
Two rows on each side may be off-set for a custom waist-and-leg fit, and the gentle chlorine-resistant elastic will not leave red marks.
How do I clean it after swimming?
Dump any solids into the toilet, then add it to your regular laundry and dry warm. Skip bleach and fabric softener.
Train the rest of the day in the Deep Seas Daytime Trainer, and stash wet gear in the Mini Wet Bag in Ahoy.
The Shark Bait print gives this reusable swim diaper a playful look for pool days and beach trips. It snaps on the side with two rows of snaps on each side, so you can offset them to dial in the fit around the waist and legs.
It's lined with a moisture-wicking fabric to help contain solids and prevent rashes, and two layers add leak protection. Swim diapers hold solids rather than liquids, so no additional diaper is needed. A reusable absorbent insert can go inside out of the water, though absorbent material isn't recommended while swimming. It can also be worn over a disposable swim diaper to meet public pool rules.
- Inner: 100% polyester; outer: 88% polyester, 12% spandex
- Rated UPF 50+ with chlorine-resistant elastic
- Wash and dry warm; no bleach or fabric softener
The Sunshine & Paradise print brings a cheerful, sun-soaked look to this reusable swim diaper from Smart Bottoms. It's a bright pick for pool days and beach trips, and it works the same way whichever colour you choose.
The moisture-wicking inner lining helps keep solids contained and guards against rashes, while two layers add leak protection. It meets the requirements for most public pools, and can be worn over a disposable swim diaper if a specific pool asks for it. No separate diaper is needed in the water; swim diapers hold solids, not liquids.
- Two rows of adjustable snaps on each side for a custom fit
- Gentle, chlorine-resistant elastic at waist and legs that won't leave red marks
- Rated UPF 50+
- Inner 100% polyester; outer 88% polyester, 12% spandex
To clean, empty solids into the toilet and add to your regular wash. Wash and dry warm; no bleach or fabric softener.
The Swim Diaper in Wild Side is Smart Bottoms' reusable side-snap swim diaper. Wild Side packs safari-name energy for pool decks, splash pads, and sprinkler summers.
Best for swim lessons and public pools that require a swim diaper under the suit. It retains solids rather than liquids, which is exactly what pool rules ask of it.
- Two rows of adjustable side snaps on each side for a custom fit
- Certified UPF 50+ with chlorine-resistant elastic
- Inner: 100% polyester moisture-wicking lining; outer: 88% polyester / 12% spandex
- Sizes 0/6M (8-16 lbs), 6/24M (16-30 lbs), 2/4T (30-50 lbs)
Does it need an insert or a diaper underneath?
No - swim diapers retain solids, not liquids. An absorbent insert may ride inside only out of the water; never add absorbent material in the pool, where it could weigh a child down.
Will it satisfy public pool rules?
It meets requirements for most public pools, and it can be worn over a disposable swim diaper where a facility insists on doubling up.
How do the side snaps work?
Two rows on each side may be off-set for a custom waist-and-leg fit, and the gentle chlorine-resistant elastic will not leave red marks.
Dry-land days belong to the Pull-On Diaper, and the soggy suit rides home in the Small Wet Bag in Play On.
