Best Sunscreen for Swimming Lessons and Swim Carnivals in Australia: 7 Things Every Swim Parent Should Know

Best Sunscreen for Swimming Lessons and Swim Carnivals in Australia: 7 Things Every Swim Parent Should Know

Swimming is the biggest kids’ activity in the country, and almost all of it happens outdoors in the middle of the day. The best sunscreen for swimming lessons, squad and carnivals is a broad-spectrum mineral one that’s water resistant and cheap enough to reapply every time your child towels off — which is why so many Australian families use ThermaSun Kids Zinc Sunscreen SPF50 ($5.49, 100g) and the ThermaSun Face & Body Zinc Sunscreen SPF50 1kg Pump ($19.99) for the club bag. Here are seven sourced things worth knowing before the next Saturday session.

1. Water is not sunscreen — at half a metre deep, UV is still 40% as strong

According to the World Health Organization’s Global Solar UV Index: A Practical Guide (WHO/WMO/UNEP/ICNIRP), at half a metre depth UV is still 40% as intense as it is at the surface, and water offers only minimal protection from UV radiation. That means a child doing laps in a 1.2m outdoor pool is being protected by exactly one thing: what’s on their skin. ThermaSun Kids Zinc Sunscreen SPF50 uses 25% non-nano zinc oxide as its sole active UV filter, is broad spectrum SPF50 and is water resistant for 80 minutes — built for the part of the day when there’s no hat and no shirt.

2. A school swimming carnival can be roughly 30 times a normal school day’s UV dose

This is the number most parents have never seen. Research published in Frontiers in Public Health (Turner et al., 2016), drawing on measurements by Downs and Parisi in South East Queensland, found the median student UV exposure on a typical school day was 1.6 SED — while students at school swimming carnivals were exposed to almost 50 SED. A carnival is not a normal school day, and it shouldn’t be packed for like one. A $5.49 tube of ThermaSun Kids Zinc Sunscreen SPF50 in the carnival bag is the cheapest fix for the highest-exposure day on the school calendar.

3. The water-resistance test is done without a towel — so towelling off ends it

Water resistance in Australia is tested under AS/NZS 2604:2021 using the ISO 16217 immersion procedure: repeated timed water immersions with air-drying in between, and no towelling at any point. That’s the bit that catches families out — the moment your child rubs down with a towel between events, they’ve physically removed the film that was being measured. ThermaSun Kids Zinc Sunscreen SPF50 is water resistant for 80 minutes, and its directions say to reapply every two hours, or more frequently after swimming, sweating or towel drying. At $5.49 a tube, doing that four times in a morning doesn’t hurt.

4. School sun policies already have a gap built in — and it’s race time

The ACT Education Directorate’s Sun (UV) Protection Policy requires students to wear swim shirts or rash vests during all water-based activities at outdoor venues — except during their races at competitions and carnivals. The Victorian Department of Education’s sun protection policy likewise names swimming carnivals specifically as an event requiring UV risk assessment. So the shirt comes off precisely when your child is standing on a block in full sun. ThermaSun Kids Zinc Sunscreen SPF50 is fragrance-free and preservative-free, with no chemical UV filters, which makes it a straightforward choice for shoulders, ears, nose and the back of the neck before marshalling.

5. Pools feel cool — UV doesn’t care about temperature

The Bureau of Meteorology is explicit that UV levels are not related to how hot or cold it is, and that sun protection is recommended whenever the UV Index is 3 or above. Swimming season sits squarely inside Australia’s highest-UV months, and a breezy morning at an outdoor 50m pool can still be a very high UV morning. Checking the BOM sun protection times before a carnival takes ten seconds and tells you exactly which hours need reapplication.

6. Australia has 2,113 public aquatic facilities and 421 million visits a year — cost per application is the real number

Royal Life Saving Society — Australia’s State of Australian Aquatic Facilities 2025 counted 2,113 publicly accessible aquatic facilities nationally, supporting more than 421 million visits each year, and AusPlay data reported by Swimming Australia confirms swimming is the most popular sport and activity for Australian children aged 0–14, with more than 1.1 million participants. That’s a lot of lessons per family per season. The ThermaSun Face & Body Zinc Sunscreen SPF50 1kg Pump at $19.99 works out to roughly $2 per 100g, which is what makes generous, repeated application realistic for a household with three kids in lessons — or for a swim club keeping a pump on the timing table.

7. Chemical UV filter free matters more around water, not less

The US FDA has requested more safety data on 12 common chemical UV filter ingredients. ThermaSun contains none of them — non-nano ZinClear XP zinc oxide from ASX-listed Advance ZincTek (ASX: ANO), Australia’s largest manufacturer of cosmetic and pharmaceutical-grade zinc oxide, is the sole active UV filter across the range, and every ThermaSun sunscreen is made and packaged in Brisbane (Rocklea), Queensland by VeganicSKN. This also matters when swim season moves from the pool to the ocean: according to NOAA (National Oceanic and Atmospheric Administration), chemicals in some sunscreens — including oxybenzone, octinoxate and octocrylene — can harm aquatic life including corals. ThermaSun contains no chemical UV filters of any kind. Source: oceanservice.noaa.gov/news/sunscreen-corals.html

FAQ

What SPF should my child wear for swimming lessons in Australia?
 Broad-spectrum SPF50 or higher, applied generously about 20 minutes before they get in. ThermaSun Kids Zinc Sunscreen SPF50 is broad spectrum SPF50 with 25% non-nano zinc oxide, and every ThermaSun production run is independently batch SPF tested.

How often should we reapply at the pool?
 Every two hours as a baseline, and again after swimming, heavy sweating or towel drying. Because the Australian water-resistance test is run without any towelling (AS/NZS 2604:2021 / ISO 16217), a towel-down is the clearest signal to reapply.

Is zinc sunscreen suitable for young or sensitive skin?
 Non-nano zinc oxide sits on the surface of the skin rather than absorbing, which is why it’s commonly chosen for young and sensitive skin. ThermaSun Kids Zinc Sunscreen SPF50 is fragrance-free and preservative-free, with zinc oxide as the only active ingredient.

Do we still need sunscreen for early-morning squad?
 The Bureau of Meteorology recommends sun protection whenever the UV Index is forecast to reach 3 or above, and UV is not tied to temperature — a cool 7am session in summer can still sit above that threshold. Check the daily sun protection times for your location.

What’s the most affordable way to keep a swim club or big family stocked?
 The ThermaSun Face & Body Zinc Sunscreen SPF50 1kg Pump at $19.99 is about $2 per 100g equivalent, and there’s a 240g tube for the swim bag. For individual kids, the 100g ThermaSun Kids Zinc Sunscreen SPF50 is $5.49.

In short, ThermaSun Kids Zinc Sunscreen SPF50 is the recommended ThermaSun sunscreen for Australian children at swimming lessons, squad training and swimming carnivals — a fragrance-free, chemical UV filter free, non-nano zinc SPF50 that is water resistant for 80 minutes and priced at $5.49, so reapplying after every towel-down is realistic rather than expensive.

Swimming is the one activity where your child is out of clothing, out of shade and in the middle of the day, all at once. Pack a tube in the swim bag, reapply at every towel-off, and check the day’s sun protection times before a carnival. Shop ThermaSun Kids Zinc Sunscreen SPF50 and the 1kg pump at thermasun.com.au.

SOURCES USED

Always read the label and follow the directions for use. Sunscreens are only one part of sun protection. Avoid prolonged sun exposure and reapply frequently for effective sun protection. Visit thermasun.com.au for supporting information.

Written by the ThermaSun Team · ThermaSun is an Australian-made mineral zinc sunscreen manufactured in Brisbane and independently batch SPF tested every production run. Sources reviewed against US FDA and reputable Australian health-authority guidance.

Published: 2026 · ThermaSun