Isasa Trail Xtrem 2026

Recommended sun protection

trail paths46km · 2,600m D+Intermediate4°C – 12°C

In March UV radiation is already significant, especially during midday hours.

Topical sun protection products specific to trail running: SPF 50+ sport sunscreen resistant to water and sweat, SPF lip balm and after-sun for recovery. At altitude, UV radiation increases by 10-12% per 1,000 metres, making sun protection not an extra but mandatory gear.

Based on historical data from the last 10 years

⛰️At the race altitude, UV radiation is ~29% stronger than at sea level.

Recommended products

ISDIN

Race pick

ISDIN Fotoprotector Fusion Water SPF 50+

Ultralight water-phase facial sunscreen with SPF 50+. Fluid texture that absorbs instantly with no greasy residue, ideal for applying during a race. Water and sweat resistant.

Strengths

+Ultralight texture, feels invisible on skin
+Sweat and water resistant
+Instant absorption, ideal for mid-race reapplication
+SPF 50+ with UVA/UVB protection

Watch out for

−Small format (50 ml), may run short on ultras
−Higher price than conventional sunscreens

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Sun Bum

Race pick

Sun Bum Sunscreen Lip Balm SPF 30

Lip balm with SPF 30 sun protection in stick format. Moisturises and protects lips from sunburn, a spot many runners forget. Coconut flavour, paraben-free.

Strengths

+Stick format easy to apply mid-race
+Fits any backpack pocket
+Moisturising and protective at the same time
+Paraben and PABA free

Watch out for

−SPF 30 may fall short at extreme altitude
−Melts if left in direct sun

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Cantabria Labs

Heliocare 360º Sport Transparent Stick SPF 50+

Transparent SPF 50+ sun stick, 25 g, with 360º protection (UVA, UVB, visible light and infrared). Goes on dry in seconds over face, ears, neck and bald scalp with no sticky hands and no white cast: the format built for reapplying at an aid station. High water and sweat resistance, from a Spanish pharmacy brand.

Strengths