4F men’s insulated thermal underwear is a thermal clothing top designed to be worn as a second layer while skiing and during other activities in cold conditions. The brushed inner side of the fabric helps retain warmth, while the comfortable regular fit provides freedom of movement. This model from 4F is suitable as an insulating layer under a ski jacket.

The 4FWarm technology used in the garment supports thermal comfort by helping to reduce the loss of body-generated heat. The soft, brushed inner finish provides additional insulation during activities in low temperatures. The main fabric consists of 90% polyester and 10% elastane. The addition of elastane increases the fabric’s flexibility, allowing the garment to adapt to body movements while skiing and during other winter activities.

The regular fit provides a comfortable fit without excessive pressure, allowing unrestricted movement. Flat seams help reduce friction between the fabric and the skin, lowering the risk of irritation during extended use. The classic collar provides additional coverage around the neck. The combination of the insulated inner side, flexible fabric and functional construction means that this men’s thermal underwear top supports comfort during active leisure on the slopes.

KEY FEATURES

• Brand: 4F
• Type: men’s insulated thermal underwear top
• Purpose: second clothing layer for cold conditions
• 4FWarm technology: supports heat retention and thermal comfort
• Insulation: soft, brushed inner side helping to reduce heat loss
• Fit: regular – comfortable fit and freedom of movement
• Seams: flat, reducing the risk of chafing and irritation
• Collar: classic, covering the neck area
• Material: flexible synthetic fabric
• Main fabric: 90% polyester, 10% elastane
• Use: skiing and winter activities