What the best sun cream does
The best sun cream protects your skin from sunburn, long term damage, and skin cancer by reliably screening UVB (sunburn) and UVA (ageing, deeper skin damage). It should be broad spectrum, water resistant when needed, suitable for your skin type, and applied generously and often. No single product fits everyone; the best choice depends on your skin sensitivity, how you use it, and the kind of protection you prefer.
SPF and UVB protection
Sun Protection Factor (SPF) indicates how much UVB protection a product offers compared with unprotected skin. Higher numbers give more protection, but not a proportional increase in real-world conditions. SPF 30 blocks about 97% of UVB; SPF 50 blocks about 98%. No sunscreen blocks 100% of UVB. Apply enough—about 2 mg per cm², typically a teaspoon for the face and six teaspoons for the average adult body—to achieve the labelled level of protection.
How much is enough
- Face and neck: roughly 2 mg/cm², about a teaspoon or two finger lengths.
- Adult full body: around 35–40 ml (about six to seven teaspoons) for each application.
- Apply 15–30 minutes before going outdoors and reapply at least every 2 hours, or sooner if swimming or sweating.
Broad spectrum and UVA protection
UVA contributes to skin ageing and long term skin damage, and can pass through glass and clouds. A broad spectrum sunscreen screens both UVA and UVB. In many markets, a UVA PF (UVAPF) rating, a PA system (e.g., PA+++), or a star rating indicates UVA protection. Look for clear broad spectrum labeling rather than relying solely on SPF.
Water resistance and practical use
No sunscreen is fully waterproof. In the US, products may be labeled water resistant for 40 or 80 minutes; elsewhere, look for 40 or 80 minute labels. Choose water resistant formulas for swimming, sport, or heavy sweating, remembering that you still need to reapply after towel drying or the stated time limit.
Choosing by skin type and concerns
Matching the formula to your skin helps you use it consistently. Options vary by texture, finish, and additional skin benefits.
Dry or sensitive skin
Creams with hydrating ingredients such as glycerin, ceramides, or dimethicone can help. Mineral filters (zinc oxide, titanium dioxide) are often better tolerated by sensitive or reactive skin, though modern chemical filters are also formulated for sensitivity.
Oily or acne-prone skin
Look for non-comedogenic, oil free, or mattifying labels. Lightweight gels, fluid lotions, or sprays that absorb quickly can reduce shine. Fragrance free or dye free options may help if fragrances trigger issues.
Everyday vs outdoor use
- Daily commute or office: SPF 30 to 50, broad spectrum, comfortable texture for consistent use.
- Beach, hiking, sport: SPF 50, broad spectrum, water resistant, applied more frequently.
- Children and sensitive skin: mineral-based options, minimal fragrance and preservatives, pediatrician recommended where appropriate.
Safety, filters, and regulation
Modern sunscreens in many countries use a combination of UV filters approved by regulators. Some filters are mineral (physical), some are chemical. Regulatory authorities monitor safety data; formulations vary by region. If you have specific medical conditions, medications, or concerns about ingredient absorption, consult a healthcare professional or dermatologist.