Base layer

Unlike a conventional cotton shirt, functional underwear retains significantly less moisture. Cotton can become saturated with sweat during exertion, dry slowly, and then feel cold against the skin. Technical performance materials, by contrast, are designed for rapid moisture transport and short drying times. Elastic fibres also ensure that the garments fit close to the body and move with active movements.

The term ski underwear is often used for insulating functional underwear worn under a ski jacket and ski trousers in low temperatures. The functional principle is the same as that of a base layer for sailing and outdoor sports: moisture should be transported away from the body and temperature regulation should be supported. However, not every base layer is primarily intended to provide warmth. For summer conditions, there are lightweight functional shirts with a cooling effect or integrated UV protection.

Our functional short-sleeve and long-sleeve shirts can therefore be worn not only as the first clothing layer. In warm and dry weather, they can also be worn on their own as lightweight sailing, training, or outdoor shirts. Quick-drying materials support wearing comfort when the top becomes damp from sweat or spray. Integrated UV protection is particularly useful during long periods on the water, as sunlight can feel more intense there due to reflections. A cooling effect supports the body climate in high temperatures and during active movement.

Long-sleeve shirts provide greater skin coverage and are suitable for sunny days, changing temperatures, or as a close-fitting layer under a midlayer. Short-sleeve shirts are a lighter alternative for warm conditions and intensive activities. Which version is more suitable depends on the temperature, sun exposure, activity level, and the layers worn over it.

For the lower body, the category includes functional men’s underwear and long functional trousers. Close-fitting underwear supports moisture transport and should not slip out of place under sailing trousers or technical outdoor clothing. Long base layer trousers provide additional coverage and can be worn under offshore gear, softshell clothing, or ski wear in cooler conditions. Combined with an insulating midlayer, this creates a flexible layering system.

Socks also influence comfort within sailing and outdoor clothing. They should fit comfortably, create as little friction as possible, and suit the respective type of footwear. Short styles are practical under sailing shoes or sneakers, while longer socks provide more coverage in cooler temperatures.

The Active Tube Scarf Protectio complements the range as a versatile functional accessory. With UPF 50+, it protects sensitive areas such as the neck and nape from intense sun exposure. Depending on how it is worn, a neck gaiter can also provide lightweight protection from the wind and can be used for sailing, hiking, skiing, or other outdoor activities.

When choosing a base layer, fit, material, and the intended temperature range are particularly important. The garment should fit close to the body without feeling restrictive or limiting freedom of movement. For warm conditions, quick drying, breathability, UV protection, and a possible cooling effect are the main priorities. At low temperatures, moisture management and the combination with an insulating midlayer are especially important.

Integrated UV protection in functional clothing reduces the amount of ultraviolet radiation that reaches the skin through the fabric. This is particularly beneficial on the water, where sailors and watersports enthusiasts are often exposed to the sun for many hours.

• UV Protection 50+: High textile protection for the areas of skin covered by the fabric.

• Long-sleeve shirts: Provide additional coverage for the arms and shoulders.

• Neck gaiters: Protect the neck and nape from sun exposure.

• Close-fitting design: Helps keep the fabric securely in place during movement.

• Additional sun protection: Exposed skin should still be protected with a suitable sunscreen.

Textile UV protection is especially practical because it does not need to be reapplied like sunscreen. However, it only protects the areas actually covered by the fabric and should not be considered a complete substitute for sun protection.

A cooling effect helps support a comfortable body climate during warm weather and intense physical activity. Depending on the material and fabric technology, moisture is quickly transported away from the skin, allowing it to evaporate efficiently. This evaporation creates a pleasant cooling sensation and helps reduce heat build-up.

• Moisture-wicking: Sweat is quickly moved away from the skin.
• Fast-drying: The fabric dries rapidly, helping keep the garment comfortable.
• Cooling effect: Supports temperature regulation during hot conditions and strenuous activity.
• Breathable: Promotes airflow and reduces heat accumulation.
• Ideal for warm weather: Particularly suitable for sailing, hiking, running, and other outdoor activities in high temperatures.

A cooling effect does not actively lower body temperature. Instead, it enhances the body's natural cooling process by improving moisture management and evaporation, helping you stay comfortable for longer during physical activity.

The base layer is the first and closest-fitting layer in a functional clothing system. Its performance depends on how effectively it works with the layers worn over it.

Base Layer

Functional underwear or a close-fitting performance shirt transports moisture away from the skin. Depending on the temperature, short- or long-sleeve tops as well as functional underwear or trousers can be worn.

Midlayer

Fleece, a Tec midlayer, or another insulating layer retains body heat. In low temperatures, insulating functional trousers can provide additional warmth for the lower body.

Outer Layer

Sailing jackets and sailing trousers protect against wind, rain, and spray. When skiing, a ski jacket and ski trousers perform the same function. The outer clothing should support moisture transport from the layers underneath.

The layering system can be adjusted flexibly: in summer, a functional shirt can be worn on its own, while in cold conditions, functional ski underwear, an insulating midlayer, and a protective outer layer can be combined.

Since 1991, Marinepool has been developing functional sailing apparel based on the principle of “From Sailors for Sailors.” Founded by active sailors, the brand continues to work closely with sailing clubs, national teams, competitive sailing associations, and sea rescue organizations. The practical experience gained through these partnerships is directly incorporated into the development of every product—from protective sailing apparel to close-fitting base layers designed for different temperatures and activity levels.

Marinepool has long been a partner of numerous international regattas, sailing events, and top-level teams. These include the Austrian Sailing Federation, the German Sailing League, and the Bayerischer Yacht-Club. Real-world testing has shown how essential reliable moisture management, fast-drying materials, and unrestricted freedom of movement are for sailors and crews.

Experience gained from offshore racing and competitive sailing also helps us continuously refine our functional underwear and technical shirts. Different fabric weights, close-fitting designs, cooling technologies, and integrated UV protection allow each base layer to be matched to the weather conditions, sailing environment, and intended activity.

Marinepool combines maritime expertise with advanced performance textiles. Our functional underwear, short- and long-sleeve shirts, briefs, and base layer trousers are designed to wick moisture away from the body and help maintain a comfortable body climate during physical activity. Depending on the model, quick-drying, cooling, odor-resistant, or insulating properties further enhance performance.

Selected tops feature integrated UV protection and can be worn on their own in warm weather. In colder conditions, long base layers and functional ski underwear provide the close-fitting foundation beneath fleece, a midlayer, and a protective outer shell. Performance socks and a UPF 50+ neck gaiter complete the functional clothing system for sailing, skiing, and a wide range of other outdoor activities.

Base layers are typically made from technical synthetic fibres such as polyester, polyamide, and elastane. These materials are lightweight, stretchy, and exceptionally quick-drying. They efficiently wick moisture away from the skin and retain their shape even during intensive use. Some models also incorporate recycled fibres or feature odor-resistant treatments for enhanced long-term comfort.

Cotton absorbs and retains large amounts of moisture. During physical activity, it can become saturated with sweat, dry slowly, and feel cold against the skin. This increases the risk of cooling down, especially during less active periods or in windy conditions.

Technical base layer fabrics, by contrast, are designed to wick moisture away from the body, dry quickly, and help maintain a balanced body climate. This makes them a much better choice for sailing, skiing, hiking, and other outdoor activities where comfort and temperature regulation are essential.

Functional fabrics transport sweat away from the skin to the outer surface of the material, where it can evaporate more quickly. This process, known as the wicking effect, helps keep the skin dry and supports the body's natural temperature regulation—especially during physical activity or in changing weather conditions.

Short-sleeve base layers are best suited for warm temperatures or high-intensity activities where maximum ventilation is important. Long-sleeve base layers provide additional protection from the sun, wind, and cooler temperatures, making them ideal for changing seasons or extended periods on the water.

The fit is crucial to the performance of a base layer. It should fit close to the body to allow moisture to be transported away from the skin efficiently, while still providing full freedom of movement. A garment that is too loose can reduce the effectiveness of moisture management, whereas a fit that is too tight may compromise comfort.

Yes. Many base layers are suitable not only for sailing and outdoor sports but also for everyday wear. Lightweight, breathable, and quick-drying functional shirts are comfortable for commuting, travel, training, or other daily activities. Depending on the model, they can be worn as a standalone top in warm weather or as a comfortable first layer under everyday clothing in cooler conditions.

The lifespan of a high-quality base layer depends on how often it is used and how well it is cared for. With proper care—including gentle washing, avoiding fabric softener, and air drying—a quality base layer can maintain its performance for many years. However, frequent use during sports or extended time on the water may accelerate normal wear and tear.

A high-quality base layer combines effective moisture management, a close but comfortable fit, and functional materials. It should wick sweat away from the skin, dry quickly, and maintain its shape even after repeated use. Flat seams, stretchy fabrics, and good breathability also contribute to lasting comfort during physical activity. Depending on the intended use, additional features such as UV protection, odor-resistant properties, or a cooling or insulating effect can further enhance performance. The best base layer is one that matches the weather conditions, activity level, and layering system in which it will be worn.

Yes, it is recommended. In summer, the focus is on cooling, UV protection, and fast drying, while in winter, thermal insulation and effective moisture management become more important. Different fabric weights and garment designs help ensure that your base layer is optimally suited to the specific weather conditions and activity level.

A functional base layer forms the foundation of a performance clothing system for sailing, skiing, and other outdoor activities. Close-fitting functional underwear wicks moisture away from the skin, dries quickly, and can be combined with fleece, a midlayer, and a protective outer shell to suit changing weather conditions. Lightweight short- and long-sleeve functional shirts can also be worn on their own, offering features such as cooling technology or integrated UV protection. Functional men's underwear and long base layer trousers complete the layering system for different temperatures, while performance socks and a UPF 50+ neck gaiter provide additional comfort and protection. Since 1991, Marinepool has been developing technical apparel based on practical experience gained through sailing and watersports.

Last updated: August 2026