Helikon-Tex US Level 2 Thermal Layer — long-sleeve base layer

The Helikon-Tex US Level 2 thermal shirt is a long-sleeve base layer designed for those operating in moderately cold conditions who need a lightweight, breathable garment that sits flat under a combat shirt or softshell. Weighing 303 g, it integrates into a layering system without adding noticeable bulk.

The fabric is 95% polyester and 5% elastane: the polyester wicks moisture away from the skin and dries quickly during intense activity, while the elastane content lets the fabric move with the body without catching or pulling. The balance favours performance over pure insulation — this shirt manages temperature during active phases; it does not replace an insulating mid-layer in static cold conditions.

Flat seams eliminate raised edges that, under a pack or a belt, become pressure points and sources of prolonged abrasion. Raglan sleeves increase freedom of movement at the shoulder, where armour or a plate carrier already restrict mobility. The chest zip allows heat to vent without removing the outer layer, and the thumb holes anchor the cuff at the wrist, preventing it from bunching under a glove or riding up during arm movement.

Key features

• Weight of 303 g that goes unnoticed within a layering system even on long outings.
• Polyester and elastane fabric that evacuates moisture and keeps skin dry during physical activity.
• Flat seams that eliminate pressure points under harnesses, belts and packs.
• Raglan sleeves that do not restrict shoulder mobility even with overlapping kit.
• Chest zip for managing temperature without removing outer layers.
• Thumb holes that keep the sleeve in place under a glove and prevent it from riding up.