Can't I just wear a regular T-shirt?

A standard white cotton T-shirt only has a UPF rating of about 5. If it gets wet from sweat, that protection drops significantly. Always use technical apparel for extreme sun.

Does skin color matter for sun protection?

Everyone needs sun protection in extreme climates regardless of skin tone. UV damage is cumulative and can lead to heat exhaustion and severe burns in any traveler.

How often should I reapply sunscreen?

Even with UPF clothing, reapply physical sunscreen to exposed skin every 2 hours, or immediately after swimming or heavy sweating.

Protecting your skin in extreme sun: A practical packing guide

To survive extreme UV exposure, pack gear rated for UPF 50+ rather than relying on sunscreen alone. Focus on moisture-wicking, breathable fabrics that cover your skin physically to prevent burns and overheating.

Select the right fabric. Avoid thin cotton. Look for synthetic blends (polyester or nylon) with tight weaves. Check the garment label for a UPF (Ultraviolet Protection Factor) rating of 50+. A UPF 50 rating allows only 1/50th of UV radiation to reach your skin.
Maximize coverage area. Pack a long-sleeve hooded shirt with thumbholes. This covers your hands and the back of your neck—two spots most people forget to apply sunscreen to—without needing constant reapplication.
Prioritize a wide-brim hat. Choose a hat with at least a 3-inch brim that encircles the entire head. Ensure it has a chin strap so it doesn't blow away in desert or coastal winds, and look for venting panels to allow heat to escape.
Choose polarized eyewear. In extreme sun, glare from sand, snow, or water causes eye strain. Pack category 3 or 4 polarized sunglasses. Category 4 is essential if you are at high altitude or on a glacier.
Plan your sunscreen strategy. Bring a solid sunscreen stick for your face and ears; it won't leak in your bag and is easier to apply without getting greasy hands. Pack a 3-ounce tube of zinc-based mineral sunscreen for your body.

Can't I just wear a regular T-shirt?: A standard white cotton T-shirt only has a UPF rating of about 5. If it gets wet from sweat, that protection drops significantly. Always use technical apparel for extreme sun.
Does skin color matter for sun protection?: Everyone needs sun protection in extreme climates regardless of skin tone. UV damage is cumulative and can lead to heat exhaustion and severe burns in any traveler.
How often should I reapply sunscreen?: Even with UPF clothing, reapply physical sunscreen to exposed skin every 2 hours, or immediately after swimming or heavy sweating.