During an endurance race — whether a marathon, a granfondo, a trail or a long bike ride — sunscreen stops being a simple morning routine gesture and becomes part of race strategy.
As the hours pass, sweat, friction from clothing and equipment, and continuous sun exposure progressively reduce protection. This is why it's important to know when to apply it, when to reapply it, how to carry it without extra bulk, and which areas of the body are most often forgotten.
The format of the sunscreen can also make a difference: a cream is easy to spread evenly on the skin, and a compact package can be carried without adding significant weight to your kit.
In this guide we answer the most frequently asked questions from those who play outdoor sport and want to protect their skin without compromising performance.
Why sunscreen runs into your eyes during a race
One of the most common problems for those who run, cycle or take on long mountain races is cream ending up in the eyes. As sweating increases, sweat carries part of the product applied to the forehead and temples with it. This phenomenon is particularly common during the central hours of the day and during prolonged efforts.
A sunscreen formulated for sport and resistant to sweat helps limit this problem, but the way it is applied also matters. It is preferable to spread an even layer, avoiding build-up of product on the forehead and temples.
Why you're no longer protected after a few hours
No sunscreen, not even SPF 50+, maintains the same effectiveness for the entire duration of a race. The general recommendation is to reapply protection every two hours. During intense sporting activity, however, continuous sweat, friction from jerseys, backpacks or helmets and, in some cases, contact with water, progressively reduce the amount of product remaining on the skin.
After around three hours of continuous effort, the remaining protection can be significantly lower than the initial level. Not because the UV filter has stopped working, but because simply less product is left on the skin.
How to reapply cream during a race without losing time
To allow the product to spread evenly and form a protective film on the skin, it is advisable to apply the cream 20-30 minutes before the start. This gives the product time to form a uniform protective film and reduces the risk of removing it immediately when putting on a headband, helmet, backpack or other technical gear.
Reapplication, on the other hand, should not be improvised during the race, but planned before the start.
To make it simple:
- Identify in advance the point where you will reapply the cream, for example an aid station, an assistance area or a changeover. If the race includes personal assistance, handing the cream to the person supporting you is a practical solution for reapplying it without taking up space in your kit.
- In longer races, where reapplication becomes necessary, it can be useful to always carry sunscreen with you. SUNO's 50 ml packs weigh around 60 grams, take up little space and fit easily into a cycling jersey pocket or a running vest.
- When possible, quickly dry your hands before application, because skin that is completely wet with sweat makes it harder to spread the product evenly.
- The cream texture makes for even distribution of the product on the skin, helping to cover all exposed areas without leaving any uncovered.
- Focus reapplication on the areas most exposed to the sun, such as the face, neck, ears, shoulders and the backs of the hands.
Can you use sunscreen even if you sweat a lot?
Yes. In fact, those who sweat a lot should pay even more attention to their choice of sunscreen.
Formulas developed for outdoor sports are designed to offer greater sweat resistance. This doesn't mean they don't need reapplying, but that they maintain an even protective layer for longer even during intense activity.
If your sweating is particularly heavy, plan more frequent reapplications and choose SPF 50+ protection.
The backs of your hands on the bike: the area almost everyone forgets
During cycling, the backs of the hands remain exposed to the sun for many consecutive hours. Yet this is one of the areas most frequently forgotten when applying cream.
To protect it:
- Apply cream to the backs of your hands before putting on gloves. If you don't use gloves, remember to apply it 20-30 minutes before starting your ride and to reapply it every two hours.
- Also check the area between the jersey cuff and the glove, which is often left completely uncovered.
The neck during trail running: how to really protect it
In trail running, the back of the neck is one of the areas most exposed to UV rays. During long climbs the head naturally tends to tilt forward, leaving the back of the neck directly exposed to the sun for many hours.
This is why it is advisable to:
- Apply cream to the back of the neck as well, not just the front of the neck.
- Use a buff or a technical neck gaiter as additional protection, without considering it a substitute for cream on exposed areas.
- Remember that on high-altitude routes, UV radiation intensity progressively increases with altitude, making adequate protection even more important.
SUNO formulas for different sports: training or racing
The SUNO formulas are developed specifically for those looking for a sunscreen for sport capable of accompanying training and endurance races: lightweight texture, high SPF 50+ protection, sweat resistance and comfort even during long-duration activities.
The 50 ml format, weighing around 60 grams, is also designed for endurance athletes: compact, lightweight and easy to carry during a race, it lets you always have the protection you need for reapplication.
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SUNO AIR SPF 50+Ideal for high-sweat sports (e.g. running, cycling, climbing, tennis, padel, etc.) GET YOURS |
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SUNO ALPINE SPF 50+Ideal for mountain sports, especially in winter conditions (e.g. alpine skiing, ski mountaineering, mountaineering, paragliding, etc.)GET YOURS |
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SUNO FACE SPF 50+Face sunscreen ideal for sport and everyday use thanks to its complex of specific active ingredients that help counter the effects of photo-ageing. GET YOURS |
