The Science of Sun Protection
New Zealand has some of the highest UV radiation levels in the world. The ozone layer above Aotearoa is thinner than in many other countries, meaning UV rays hit harder here — even on overcast days. Understanding how the sun's energy interacts with your skin is the first step toward genuine, effective protection.
At COOLA, we combine cutting-edge sun science with eco-conscious, natural ingredients to create sunscreens that work with your skin, not against it. Here's what you need to know.
UVA vs UVB Rays
UVA rays penetrate deep into the dermis, causing premature ageing and DNA damage. UVB rays affect the outer skin layers and are the primary cause of sunburn. Broad-spectrum protection guards against both.
How SPF Works
SPF (Sun Protection Factor) measures how long a sunscreen allows you to stay in the sun without burning. SPF 30 blocks about 97% of UVB rays; SPF 50 blocks roughly 98%. No sunscreen blocks 100% — reapplication is essential.
Skin & UV Damage
UV radiation generates free radicals that break down collagen and elastin fibres. Over time, this leads to wrinkles, sun spots, and in serious cases, skin cancer — one of the most common cancers in New Zealand.
Mineral vs Chemical SPF
Mineral sunscreens (zinc oxide, titanium dioxide) sit on the skin's surface and reflect UV rays like a mirror. Chemical sunscreens absorb UV energy and convert it to heat. COOLA uses a blend for broad-spectrum coverage that feels lightweight.
Reef-Safe Formulas
Common chemical UV filters like oxybenzone and octinoxate have been shown to bleach coral reefs. COOLA's reef-safe formulas avoid these ingredients, protecting New Zealand's precious marine environments.
Natural Antioxidants
Ingredients like aloe vera, green tea extract, and vitamin E don't just protect — they actively repair. Antioxidants neutralise free radicals generated by UV exposure, helping prevent long-term oxidative skin damage.
Sun Facts for New Zealand
The UV Index & What It Means
The UV Index (UVI) is an international scale measuring the strength of UV radiation. A UVI of 3 or above warrants sun protection; in New Zealand during summer, the UVI routinely reaches 12–14 — the "Extreme" category. On these days, unprotected skin can burn in under 10 minutes.
NIWA (the National Institute of Water and Atmospheric Research) monitors UV levels across New Zealand. Checking the daily UVI forecast alongside weather is a smart habit for protecting your skin year-round.
Why Application Matters as Much as SPF Rating
Studies consistently show that most people apply only 25–50% of the recommended amount of sunscreen. The standard is 2mg per cm² of skin — roughly a teaspoon for the face and a shot glass for the body. Under-applying an SPF50 product can reduce its effective protection to SPF15 or lower.
COOLA's lightweight, fast-absorbing formulas are designed to encourage full, generous application without the greasy residue that makes people reluctant to use enough.
Organic & Natural Ingredients: Beyond SPF
COOLA uses over 70% certified organic ingredients in many products. Aloe vera soothes inflammation, sunflower oil delivers vitamin E, and rosehip oil supports skin recovery. These ingredients work in harmony with mineral and chemical UV filters to deliver protection that nourishes rather than stresses the skin barrier.
Ready to Protect Your Skin?
Explore COOLA's full range of eco-conscious, science-backed sunscreens — formulated for New Zealand conditions.