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WINTER BASE LAYER GUIDE

Find the right base layer for cool weather, winter riding, and extreme cold.

01
01

HOW TO CHOOSE A WINTER CYCLING BASE LAYER

A winter cycling base layer sits next to the skin and plays a key role in managing warmth and moisture as temperatures drop.

The right choice depends on temperature, riding intensity, and the amount of insulation you need. Lighter base layers work well in cool conditions, while thermal options add more warmth for colder winter rides.

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TEMPERATURE AND INSULATION

A winter cycling base layer sits next to the skin and plays a key role in managing warmth and moisture as temperatures drop.

The right choice depends on temperature, riding intensity, and the amount of insulation you need. Lighter base layers work well in cool conditions, while thermal options add more warmth for colder winter rides.

MOISTURE MANAGEMENT AND BREATHABILITY

A base layer should help move moisture away from the skin while allowing excess heat to escape.

This becomes especially important during harder efforts, where too much insulation can lead to overheating. The right balance between warmth and breathability depends on both temperature and intensity.

FIT AND LAYERING

A winter base layer should fit close to the body so it can work effectively underneath a jersey or jacket without creating unnecessary bulk.

In very cold conditions, an additional insulating layer can be worn between the base layer and outer jacket to increase warmth while maintaining a functional layering system.

MILD & TRANSITION CONDITIONS

For cool weather and changing temperatures, lighter base layers provide moisture management and moderate insulation without the warmth of a full thermal option.

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Core seamless base layer - black - castelli
Core seamless base layer - black - castelli
BLACK BLACK 1 color

CORE SEAMLESS BASE LAYER

85,00€

FIT: REGULAR

TEMPERATURE: 4°C - 16°C | 39°F - 60°F

Core seamless base layer ss - white - castelli
Core seamless base layer ss - white - castelli
Core seamless base layer ss - black - castelli

CORE SEAMLESS BASE LAYER SS

75,00€

FIT: REGULAR

TEMPERATURE: 8°C - 20°C | 46°F - 68°F

Medio base layer ss - melange gray - castelli
Medio base layer ss - melange gray - castelli

MEDIO BASE LAYER SS

70,00€

FIT: REGULAR

TEMPERATURE: 10°C - 18°C | 50°F - 64°F

Medio base layer w short sleeve - melange gray - castelli
Medio base layer w short sleeve - melange gray - castelli

MEDIO BASE LAYER W SHORT SLEEVE

70,00€

FIT: REGULAR

TEMPERATURE: 10°C - 18°C | 50°F - 64°F

COLD CONDITIONS

As temperatures fall, a warmer base layer helps retain more heat while continuing to manage moisture underneath the outer layers.

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Flanders 2 long sleeve - black - castelli
Flanders 2 long sleeve - black - castelli
Flanders 2 long sleeve - gray - castelli

FLANDERS 2 LONG SLEEVE

90,00€

FIT: REGULAR

TEMPERATURE: -2°C - 10°C | 28°F - 50°F

Flanders 2 warm w long sleeve - black - castelli
Flanders 2 warm w long sleeve - black - castelli
Flanders 2 warm w long sleeve - gray - castelli

FLANDERS 2 WARM W LONG SLEEVE

90,00€

FIT: REGULAR

TEMPERATURE: -2°C - 10°C | 28°F - 50°F

Merino seamless baselayer - black - castelli
Merino seamless baselayer - black - castelli
BLACK BLACK 1 color

MERINO SEAMLESS BASELAYER

100,00€

FIT: REGULAR

TEMPERATURE: -4°C - 10°C | 24°F - 50°F

Merino seamless w baselayer - black - castelli
Merino seamless w baselayer - black - castelli
BLACK BLACK 1 color

MERINO SEAMLESS W BASELAYER

100,00€

FIT: REGULAR

TEMPERATURE: -4°C - 10°C | 24°F - 50°F

ADDITIONAL INSULATION FOR EXTREME COLD

For the coldest conditions, an additional insulating layer can be worn between the base layer and outer jacket to add warmth while maintaining breathability.

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Cold days 2nd layer - black - castelli
Cold days 2nd layer - black - castelli
Cold days 2nd layer - silver gray - castelli

COLD DAYS 2nd LAYER

140,00€

FIT: REGULAR

TEMPERATURE: -8°C - 5°C | 17°F - 41°F

Cold days w 2nd layer - black - castelli
Cold days w 2nd layer - black - castelli
BLACK BLACK 1 color

COLD DAYS W 2nd LAYER

140,00€

FIT: REGULAR

TEMPERATURE: -8°C - 5°C | 17°F - 41°F

Cold days 2nd layer vest - black - castelli
Cold days 2nd layer vest - black - castelli
BLACK BLACK 1 color

COLD DAYS 2nd LAYER VEST

100,00€

FIT: REGULAR

TEMPERATURE: -4°C - 10°C | 24°F - 50°F

Cold days 2nd layer w vest - black - castelli
Cold days 2nd layer w vest - black - castelli
BLACK BLACK 1 color

COLD DAYS 2ND LAYER W VEST

100,00€

FIT: REGULAR

TEMPERATURE: -4°C - 10°C | 24°F - 50°F

HOW TO BUILD A WINTER LAYERING SYSTEM

A winter cycling kit works best when each layer has a clear role.

Base layer: worn next to the skin to manage moisture and provide the first level of insulation.

Additional insulation: used in colder conditions when more warmth is needed between the base layer and outer jacket.

Outer layer: provides the main protection from wind, rain, and cold conditions.

Choose the combination according to temperature, riding intensity, and weather rather than simply adding more layers.

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