Yarn developer Drirelease has used hygroscopic and heat-generating micro-denier acrylic fibre, blended with natural or regenerated cellulose fibres such as merino wool or lyocell to make a blend called Heat.

According to the company, Heat can provide a high thermal value, even in lightweight yarns, because the blend is designed to pull sweat and vapour away from the body to enhance thermal regulation.

It has said the yarn also provides a soft feel and high level of pilling performance, making it suitable for baselayers, midlayers, sweaters, and socks.

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