This is an essential piece of any serious mountain kit. Inspired by climbers, then refined to handle virtually anything, the Delta Jacketís a go-to when thermal efficiency, stretch, and all-mountain versatility are required. The PolartecÆ Power DryÆ fleeceís voided grid construction delivers a high warmth to weight ratio and provides outstanding freedom of movement. The simplicity of design extends its versatility ñ wear it as a midlayer in cold conditions or a standalone in cooler temperatures.