4FWarm fleece thermal underwear (top) for boys 4FJRAW25UFLEM072-62S

4F Thermal Fleece Underwear for Boys – A Soft Layer for Winter Adventures

This thermal fleece underwear for boys is designed for active days in winter conditions. The 4FWarm technology helps maintain optimal body temperature, ensuring thermal comfort while skiing and playing outdoors.

Fleece as the main material guarantees softness and a pleasant feeling of warmth, while the lightweight, mid-weight construction provides the perfect balance between insulation and breathability.

Designed to be worn as a second layer , it works perfectly under a ski jacket or over a thermal shirt. The stand-up collar protects against the cold, while the 1/3-length zipper makes it easy to put on and allows you to regulate ventilation during activity.

The slim cut fits the body well, does not restrict movement and ensures comfort during dynamic movement.

• 4FWarm technology – thermal comfort support
• Second layer of clothing – perfect under a jacket or fleece
• Fleece material – softness and pleasant warmth
• Lightweight construction – medium thickness, good breathability
• Stand-up collar – additional protection against the cold
• 1/3 length zipper – easy to put on and adjust ventilation
• Slim fit – body-hugging and comfortable to wear