The Helly Hansen Warm Ice Crew Running Top is manufactured with HH Warm technology throughout. HH Warm ultimately consists of two different components; a network of internal Lifa fibres that keep the wearer dry and a soft merino wool exterior that adds warmth and insulation. Lifa fabrics feature a hollow T3 fibre construction that imitates the myriad qualities of polar bear fur, in turn encouraging improved moisture management and insulating performance. Flatlock stitching and an inherently non-itch, allergy neutral Pure Merino wool blend is used throughout to minimise chafing and consequent skin irritation, whilst simultaneously reducing bulk to deliver a more streamlined finish.