Thirsties Swim Diaper
The Thirsties Swim Diaper comes in 2 sizes, lists sizes up to 40 lb, and starts with a size for babies up to 18 lb, per Thirsties. A snap-closure reusable swim diaper with a mesh lining, double leg gussets and adjustable rise snaps.
- Size 1 to Size 2Sizes
How the Swim Diaper stacks up
Against the 9 swim diapers we track. The shaded band is where the middle half of them fall; the dot is this one.
Size & weight chart
Weights as the maker lists them, in lb.
| Size | Weight | Shared with next size |
|---|---|---|
| Size 1 | 6–18 lb | 18–18 lb |
| Size 2 | 18–40 lb | – |
Cloth system & wash
| Type | Reusable swim |
|---|---|
| Closure | snaps |
| Fabric | Mesh interior, waterproof exterior shell (exterior material not named) |
| Washing, per the maker | Wash once before first use with additive-free detergent. Rinse solids into toilet. Wash warm. Avoid boosters/additives, sanitize cycles, pure soap, bleach and high heat. Hang dry or tumble low. |
Listed features
- Adjustable rise and hip snaps
Where to buy the Swim Diaper
Prices and availability change. We may earn a commission from some links.
- Check for recalls: Search the agency's recall list with the model number and date code from the label: CPSC recall search.
Full specs
| Thirsties Swim Diaper | |
|---|---|
| Type | Swim diaper (reusable swim) |
| Sizes and weights | Size 1: 6–18 lb; Size 2: 18–40 lb |
| Closure | snaps |
| Fabric | Mesh interior, waterproof exterior shell (exterior material not named) |
| Care | Wash once before first use with additive-free detergent. Rinse solids into toilet. Wash warm. Avoid boosters/additives, sanitize cycles, pure soap, bleach and high heat. Hang dry or tumble low. |
Compare the Swim Diaper with
How each closest rival differs from the Swim Diaper, from the makers' specs.
- Charlie BananaReusable Swim Diaper, SnapsCompare side by side
- Splash AboutHappy NappyCompare side by side
- Green SproutsEco Snap Reusable Swim Diaper$14.99Compare side by side
- HuggiesLittle SwimmersCompare side by side
Swim Diaper: questions answered
From Thirsties's published specs, last checked 2026-11-02.
What sizes does the Thirsties Swim Diaper come in?
Size 1 (6–18 lb), Size 2 (18–40 lb), per the maker. Makers size diapers by weight, and their ranges overlap. Check the maker's size chart.
Does the Thirsties Swim Diaper hold pee?
Swim diapers are made to hold solids, not pee, per their makers. Check the pool's own rules.
Still wondering? Write to us at hello@cribpicks.com and we'll look it up.
More swim diapers
- PampersSplashers Swim Pants4 sizesto 35 lb
- Green SproutsEco Pull-up Reusable Swim Diaper$12.99
- CoterieThe Swimsuit3 sizesto 40 lb$20
- Hello BelloSwim Dipes$13.99
Where these specs come from
Last checked 2026-11-02. Spot something wrong? Tell us. Read our editorial and safety policy and corrections.