The 4F men's insulated thermal base layer is a long-sleeved top designed to be worn as a second clothing layer while skiing, on winter walks and during activities in cold conditions. 4FWarm technology, a soft brushed inner side and a regular fit support thermal comfort and freedom of movement. The model is a functional choice in the category of men's fleece and brushed thermal underwear, suitable as an additional insulating layer under a jacket.

The applied 4FWarm technology helps retain the heat generated by the body and limit heat loss during activities in low temperatures. The brushed inner finish provides softness and a pleasant feel against the skin. The main material consists of 79% polyester and 21% elastane, while the additional material contains 88% polyester and 12% elastane. The combination of these fibres provides stretch and allows the knit to adapt to body movements.

The regular fit with a hip-length cut provides a comfortable fit without excessively restricting movement. The high stand-up collar additionally protects the neck from cold air, increasing the garment's functionality during outdoor activities. Flat seams reduce friction between the material and the skin, helping to minimise the risk of chafing during extended wear. The 4F men's thermal underwear top combines an elastic construction with an insulated inner side, making it a practical addition to clothing for the slopes and colder days.

KEY FEATURES

• Brand: 4F
• Type: men's insulated long-sleeved thermal underwear top
• Purpose: second clothing layer in cold conditions
• 4FWarm technology: supports warmth retention and thermal comfort
• Inner finish: soft, brushed, supporting thermal insulation
• Fit: regular – comfortable fit and freedom of movement
• Length: hip-length
• Collar: high stand-up collar protecting the neck
• Seams: flat, reducing the risk of chafing
• Material: stretch synthetic knit
• Main material: 79% polyester, 21% elastane
• Additional material: 88% polyester, 12% elastane
• Use: skiing, winter walks and activities in cold conditions