Happy Nappy DUO **Inside is a highly technical active silver inner layer

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The Happy Nappy DUO is the most advanced reusable swim nappy in the world.

The all in one double nappy system means you can ditch the disposables to help protect the environment, whilst at the same time is scientifically proven to help protect your baby and other swimmers from pathogens that cause tummy bugs such as Cryptosporidium, E.coli and even COVID19.

This is a significant development for baby swim schools and pool operators. An outbreak of these pathogens is a leading cause of sickness, which can result in pool closures.

The Happy Nappy DUO works thanks to the innovative Silver Lining fabric inside the Happy Nappy.

Silver has natural anti-bacterial properties and is gentle on delicate skin. Designed to hold and trap any faecal matter, the silver lining destroys any bacteria or viruses present in the nappy. This means water or urine mixing with faecal matter that leaks out into the pool is virtually sterile; therefore, less likely to carry harmful diseases, ensuring pool water is clean and safe for all swimmers.

It’s the only nappy system you will ever need for your baby’s swim class. The classically form fitting and leak proof outer layer is still the Happy Nappy you know and love, but inside is a highly technical active silver inner layer, which is scientifically proven to kill pathogens that cause tummy bugs - like Cryptosporidium, E.coli and COVID 19 - inside the Nappy, before they can enter the water. Making the pool safer for your baby and for other swimmers too.

Working with one of the world’s leading virologists and 4 years in development, the SILVER LINING inner layer is extremely gentle on babies skin, but highly effective in destroying pathogens that can be found in faecal matter.

But that’s not all. Because the Happy Nappy DUO has been approved by swim schools as a double nappy system, it means you no longer need to buy disposable swim nappies to wear under the Happy Nappy, saving money and saving the planet by not contributing to millions of tons of disposable nappy waste per year, which can take up to 500 years to break down in landfill.

Long lasting, reliable and with a naturally antibacterial layer to help stop the spread infections, the Happy Nappy DUO really is the only swim nappy you will ever need.

  • All in one double nappy system, incorporating the famous Happy Nappy
  • Approved by swim schools
  • Replaces disposable swim nappies, meaning less waste in landfill
  • Kills pathogens such as Cryptosporidium, E.Coli and COVID 19 in its unique silver lining.




(Extra-Small) Newborn

31 - 36 cm

15 – 20 cm

(Small) 0 – 3 m

34 – 41 cm

17 – 22 cm

(Medium) 3 – 6 m

37 – 44 cm

19 – 24 cm

(Large) 6 – 12 m

40 – 47 cm

20 – 26 cm

(Extra-large) 1 – 2 y

42 – 50 cm

22 – 31 cm

(Extra-extra-large) 2 – 3 y

44 – 52 cm

26 – 33 cm


We Dispatch All Orders On The Same Day (Orders Received Before 3pm On Business Days)

Here are our estimated shipping delivery times:

Hong Kong: 1 - 3 business days World: 12-20 business days

Your order will be sent out on average within 24 hours of ordering.

International shipping:

International shipments may incur customs fees. The customs policy is different in each country, and the fee is usually based on a variety of factors like weight, value, and size. We do not take responsibility for customs fees.

Order never arrived:

If your order didn't end up arriving, be sure to let us know! First, check your shipping confirmation and check that you had entered the correct address. If the address was incorrect, we'd be happy to send you another order to the correct address, however, it will have to be at your cost. If the shipping address was correct, get in touch with us at info@streamlinesports.com.hk making sure you quote your order number.

Return Policy:

The last thing we want is for you to be stuck with a damaged or defective item. If an order arrives damaged, then please get in touch with a photo within 30 days of your initial order. Refunds are only approved if the item does not match the description on our website or arrives defective. Let us know if you have any problems and we'll get you sorted out.
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