KNOW YOUR FLOW
Absorbency Guide
Our Teen Diamond Back One Piece Period Swimsuit have a Moderate/Heavy absorbency.
Check out the below guide to see how this level stacks up against our other products.
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Teen Diamond Back One Piece Period Swimsuit
●●●●○ | Moderate/Heavy - Check out our absorbency guide here
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For beach days, pool hangs and holiday swims — with built-in period protection.
The Eco Period Teen Diamond Back Swim One Piece is designed for comfort, confidence, and lighter flow days in and around the water. With a sleek open diamond back and slim supportive straps, it offers a flexible, secure fit that moves easily while swimming.
Made from soft recycled nylon swim fabric, this piece feels lightweight, smooth and comfortable on the body while delivering discreet built-in absorbency for light flow or backup protection.
Swim. Relax. Dive in without worry.
Flow: Moderate
Absorbency: up to 30ml
Tampon equivalent: up to 6 regular tampons
Best for: moderate days, middle to end of cycle.
Feels: sleek, smooth and lightweight
Why Teens Love it
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Built-in moderate absorbency (no pads needed)
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Slim diamond back with thin straps for freedom of movement
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Soft, lightweight recycled nylon fabric
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Quick drying and breathable
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Smooth, comfortable stretch fit
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Fully lined with discreet leakproof gusset and built in chest cups.
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Perfect for beach, holidays and casual pool use
📏 Sizes:
Girls / Teen 10-12, 12-14, 14-16, 16-18
(Check our size guide so it fits just right.)
Made from recycled nylon swim fabric with stretch and softness for comfort.
Designed for:
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Beach swimming
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Holidays
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Occasional pool use
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Light training or leisure swimming
Not designed for:
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Daily squad swimming
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Heavy chlorine exposure multiple times per week
For frequent pool training, choose the Teen Racerback Pro One Piece.
Care
Cold machine wash
Line dry
No bleach, soak, tumble dry or softener
🌱 Why Choose Eco Period?
- Mum‑owned, Aussie designed with real girls in mind
- Ships from Sunshine Coast
- Available for self‑managed and plan‑managed participants
- Focused on comfort, confidence & feel
Bundle & save options available!
Free shipping over $120
Fabric Composition: Recycled nylon outer fabric
Can she wear this without a tampon or pad?
Yes. Eco Period swimwear has built-in absorbency designed to be worn on its own for light flow or backup protection.
Is it suitable for heavy days?
We have styles that are suitable for light to moderate flow/ days and for heavy flow days. For heavy flow or long swim sessions, we recommend our Racerback Pro One Piece or Tie Side Swim Shorts.
Will it work in the pool and ocean?
Yes. Designed for beach and casual pool use. For frequent squad swimming, choose our Pro range which is made of Polyamide which is chlorine resistant.
Will it feel bulky?
No. The absorbent lining is slim and feels like normal swimwear.
How should it fit?
It should fit snug at the leg opening to activate leakproof protection. If between sizes, size up.
How do I wash it?
Cold machine wash. Line dry. No softener or tumble drying.
When your swimwear arrive, try them on over your regular, clean underwear before use to check the fit. Make sure to give them a wash before your first wear to improve the absorption performance.
Then to use the swimwear, simply wear them like you would with any of your other swimwear.
Step 1 Wash your Eco Period swimwear before wearing / using them. This activates the EcoTech and primes it for use.
Step 2, After wearing, rinse in cold water until the blood/ fluids are mostly removed. You can do this in the shower to save water, but just do it before the water heats up past 30 degrees, as heat will set stains into the fabrics.
Step 3. Pop your swimwear into a delicates wash bag and into the washing machine on a cold wash. Use a liquid natural detergent.
No fabric softeners.
Step 4. Hang dry on the line outside. Line drying is best as it is kinder to the fabrics. Just don't leave them out on the line for days.
Eco Period swimwear should NEVER:
Be cleansed with harsh detergents (these abrade and break down clothes which shortens their effectiveness and lifespan)
Be cleansed with fabric softeners (it's like fabric cholesterol and blocks the pathways in the fabric through which the liquid travels)
Be bleached (bleach kills everything, need we say more)
Be dry cleaned (putting the products into such a harsh environment with or without the added chemicals is bad)
Be washed in very hot water (heat breaks down the fibres and natural compounds that make these products so effective.
Think your individual decisions won't make a difference?
Well, did you know more than 12 BILLION pads and tampons are thrown out every year worldwide? Let's break this down even further to see the impact you CAN make - the average woman alone uses 11,000 pads, tampons and panty liners in their lifetime. That’s a lot of landfill! It's time to make the switch to Eco Period, you won't look back.
NEW TO REUSABLE PERIOD CARE?
How does Period Swimwear work?
Eco Period swimwear is designed with absorbent layers and moisture-wicking materials to manage menstrual flow. The absorbent layers trap and absorb menstrual fluid, keeping you comfortable while swimming, by ensuring no menstrual fluid leaks out. The outer fabric is water-resistant to prevent water from entering the gusset. No swelling in water and No tampons are required.
WHO WE ARE
Eco Period offers beautifully crafted, quality period garments that are made to last, and are just as good for your body as they are for the environment.
We are passionate about making a difference through our products and hope to help you transition (or continue) your journey towards zero waste, eco and organic period solutions.
SUPER
●●●●● 30-60ml
The lining is thicker and extends to the back waist seam, so it covers you for overnights.
HEAVY
●●●●○ 25-40ml
Choose Heavy absorbency if you have a heavy flow or for your heavy flow days or for moderate incontinence.. The lining extends to the back waist seams, so it covers you for overnights or when laying down on your side and back.
MODERATE/HEAVY
●●●○○ 20-30ml
Perfect to use if your flow is moderate, so think 3rd or 4th day of your period. Also for light to moderate incontinence leaks. These undies will also cover you at night as the leakproof lining extends up to the back waist seam (a thinner layer than the heavy absorbency).
MODERATE
●●○○○ 15-20ml
Choose Moderate absorbency for day-time wear, active wear and for when you just don't need that extra panel of protection up the back. Suitable for flows from 15-25 ml. The lining is generally a little thinner too, so does not feel bulky.
LIGHT
●○○○○ 10-15ml
If your flow is light, or you are using as a backup, choose light absorbency. This will provide a leakproof function and some absorbency as a backup.
All cotton in our products is organically cultivated and comes from suppliers who are inspected and certified as part of the Control Union Certification program. This organization has established criteria for organic production according two certification programmes, GOTS or Organic Exchange Certification. Read more about Control Union here. Organic cotton is cotton grown without any chemical fertilizers or pesticides which is better for human health as well as nature. The organic cotton is different from conventional cotton in many respects, and the difference starts at the fibre stage.
The textile industry has historically been associated with environmentally harmful processing, animal welfare issues, and complex social compliance issues such as child labor, workers’ wages, benefits, fast fashion and health and safety. The demand for certified, sustainable products is growing rapidly. Eco Period works with manufacturers that use Control Union Certified certified organic, recycled and sustainable materials.