Snugpak 2nd Skinz Coolmax Long Johns Thermal Base Layer

The 2nd Skinz Coolmax Long Johns is a base-layer thermal pant designed for extended outdoor use, from hunters on the move to professional operators. The Coolmax fabric — 94% polyester, 6% elastane — actively manages moisture, adjusting its thermal response to the intensity of physical effort.

Coolmax works through a channel-cross-section microfibre structure: ultra-fine inner fibres wick excess moisture away from the skin and spread it across a wider evaporating surface, keeping the skin dry both under exertion and during rest stops. This means the layer stays effective even when body temperature shifts rapidly — a real advantage on outings that mix movement with static halts. The relaxed fit does not compress the quadriceps or restrict stride, which matters when wearing these under tactical or hunting trousers.

The trade-off to bear in mind: Coolmax is optimised for breathability and moisture dispersal, not for static insulation in intense cold with prolonged inactivity. Anyone expecting to stand still for long periods in low temperatures should pair these with a mid-layer insulator. On their own, these work best as an active base layer, not as passive insulation. At 260 g (size M) and a packed size of 20 x 12 cm, they are easy to carry in a pack as a spare.

Key points

• Coolmax fabric moves moisture away from the skin, reducing sweat-chill during rest stops after effort.
• The 6% elastane content keeps the relaxed fit without losing shape after repeated washing.
• At 260 g and a packed size of 20 x 12 cm, they fit easily in a bag as a spare pair.
• Suited as an active base layer paired with insulating or softshell layers, depending on the intensity of the outing.

In the box

• Snugpak 2nd Skinz Coolmax Long Johns thermal pant
• Reusable carry pouch