Sun Protection and Dehydration

On the water there is no shade tree, no air conditioning, and rarely a break to drink. Sun protection and dehydration are therefore inseparably linked in regatta sailing: those who do not protect their skin suffer additional heat stress. Those who drink too little lose concentration, strength, and decision-making ability – often before thirst is even noticeable. Whether Optimist youth at the start line, 49er crew on the trapeze, or grinder on a keelboat: those who plan sun protection and fluid intake like sail trim and tactics sail more safely and stay at peak level longer.

Why Sun and Dehydration Are Especially Dangerous on the Water

Sailors are exposed to a double burden. Direct sunlight hits from above; reflected UV light from the water and deck hits from below and the sides. At the same time, hiking, trapeze work, and grinding raise core body temperature – sweat loss increases without always being noticed on the boat.

The most important factors at a glance:

• Water reflection – increases effective UV exposure by up to 25 percent compared to land
• Wind – masks the feeling of heat and thirst, but increases unnoticed fluid loss
• Movement – increases body heat production and sweating
• Clothing – light sailing suits offer partial protection; neoprene and tight fabrics increase heat stress
• Regatta rhythm – short breaks between races leave little time for recovery and rehydration

Connection to Heat, Hydration, and Nutrition

Sun protection and dehydration are part of the broader topic of Heat and Cold. The drinking strategy in detail is described in Hydration on the Water. Electrolytes and energy gels in heat can be found under Electrolytes and Energy Gels. The overall nutrition planning is covered in Sports Nutrition for Sailors.

Sun Protection: More Than Sunscreen

Effective sun protection in regatta sailing follows the layering principle: physical protection, chemical protection, and behaviour. No single measure is sufficient on its own – only the combination provides reliable protection.

Physical UV Protection

1. Sailing clothing with UV protection – long sleeves, high collar, light colours with tight weave
2. Sailing cap or buff – include neck and ears; secure cap under life jacket
3. Sunglasses – polarised, with side shields against reflection from the water
4. Gloves – during prolonged hiking they protect the backs of the hands from sunburn
5. Sun awning and bimini – on keelboats create shade for crew rotation

Chemical Sun Protection: Applying Sunscreen Correctly

Sunscreen is mandatory but does not replace clothing. Regatta sailors have special requirements:

• Sun protection factor (SPF) – at least SPF 30, SPF 50 for long regatta days
• Broad-spectrum protection – UVA and UVB, water-resistant and sweat-resistant
• Application – 20 minutes before the start, reapply every two hours, immediately after swimming
• Amount – about one teaspoon per body region; do not apply sparingly
• Face – additionally lip balm with SPF; protect the eye area

Dehydration: Causes, Warning Signs, and Consequences

Dehydration occurs when more fluid is lost than is taken in. On the boat this is particularly easy because thirst is delayed and wind as well as adrenaline mask body sensations.

Typical Causes of Dehydration in Regatta Sailing

• Intensive hiking and trapeze work combined with direct sunlight
• Long waiting periods at the start boat without active drinking
• Dry heat with strong wind – increased loss through exhaled air
• Neoprene or tight sailing clothing – increased sweating, impaired cooling
• Alcohol the evening before – reduces hydration capacity on regatta day
• Too little salt with lots of water – risk of hyponatraemia with excessive pure water intake

Warning Signs in Three Phases

Early phase (1–2% body weight loss):

• Dry mouth, mild headache
• Slightly elevated pulse, first lapses in concentration

Intermediate phase (2–3% body weight loss):

• Declining hiking strength and delayed reaction to wind shifts
• Irritability, restlessness, or unusual fatigue
• Dark urine, little urination despite drinking

Critical phase (from 3% body weight loss):

• Dizziness, nausea, muscle cramps
• Confused decisions at the helm or in crew communication
• If heat stroke is suspected: hot, dry skin, impaired consciousness – alert medical staff immediately

Practical Strategy: Sun Protection and Drinking in Regatta Daily Life

Those who take sun protection and dehydration seriously plan them like any other regatta preparation – structured, proactive, and coordinated across the crew.

Before the First Race

1. Start hydration – drink 500 ml of water or isotonic drink the evening before and in the morning
2. Apply sunscreen – at least 20 minutes before leaving the shore
3. Fill water bottles – at least 1.5 litres per person for a regatta day with three races
4. Pack electrolytes – in heat above 25 degrees Celsius bring isotonic powder or tablets
5. Check clothing – lay out UV shirt, cap, sunglasses, gloves

During the Race

• Drink small sips every 15–20 minutes – not only when thirsty
• Aim for 500–800 ml per hour during intensive exertion
• Reapply cream to exposed skin areas during race pause windows
• Put cap and glasses back on immediately after capsize or swimming

Between Races

• Rest in the shade of the coach boat or under the bimini
• Drink cold, isotonic beverages – ice in the bottle as pre-cooling
• Light snacks with some salt – see Regatta Days and Meals
• Brief crew check: who seems tired, irritable, or unfocused?

Sun Protection and Hydration on Regatta Day – Six-Step Process

Dehydration by Boat Class

Fluid and sun protection needs vary depending on intensity, waiting time, and exposure:

Checklist: Sun Protection and Dehydration

Before every regatta day this checklist should be completed:

• Water bottles filled (at least 1.5 litres per person)
• Electrolytes and isotonic tablets packed
• Water-resistant SPF 50 sunscreen in the kit
• UV shirt, cap with neck protection, sunglasses ready
• Gloves for intensive hiking days included
• Pre-hydrated the evening before and in the morning
• Crew informed: proactive drinking, not only when thirsty
• Emergency plan for suspected heat stroke discussed
• Coach boat or keelboat equipped with cold drinks
• Evening recovery drink and skin care planned

Special Situations

Multi-Day Regattas

Over three to five race days in a row, UV and fluid loss accumulate. Sun protection and hydration must remain constant throughout the entire period – not only on the first day. In the evening: care for skin with after-sun or moisturiser, drink 500–750 ml recovery drink, sleep early. Details on regeneration between races: Sleep and Recovery Between Races.

Heat Plus Intensive Hiking

With Hiking and Muscle Fatigue, sweat loss increases significantly. Combine light clothing, regular drinking, and short shade breaks.

FAQ: Common Questions About Sun Protection and Dehydration

Is Water Alone Enough?

No for longer regatta days; electrolytes are necessary.

How Often to Reapply Sunscreen?

Every two hours, immediately after swimming.

Can You Drink Too Much?

Yes, pure water without salt can promote hyponatraemia.

Does Neoprene Help Against the Sun?

Partially, but it increases heat stress and sweating.

When to Abandon the Race?

Immediately with dizziness, nausea, or impaired consciousness.

Related Topics

• Heat and Cold
• Hydration on the Water
• Electrolytes and Energy Gels
• Cold-Water Sailing
• Hiking and Muscle Fatigue

Last updated: July 4, 2026