There's a lot going on here so here's the breakdown.

A Midlayer Shirt made from a super-tight weave. It is a technical, soft, durable, windproof fabric that traps still air to improve insulation efficiency.

50% is made of recycled fibres and the DWR (Durable Water Repellent) finish is PFC free and provides protection from light snow and rain.

Practical considerations like raglan sleeves provide better movement and a water-repellent zip keeps the elements out at the theoretical weak point. A hidden back strap means this Midlayer is compatible with Norse shell pieces if you're ready to Voltron this into the perfect winter piece.