The i-Run team says
Technologies
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Omni-Heat Reflective
The Omni-Heat Reflective technology is placed in the inner lining of the fabric to reflect your body heat. The material is completely reflective and breathable.
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Thermarator
Warmth and Lightness Without Feathers
High insulation-to-weight ratio. Ultrafine fibers trap and retain heat, even when the material is wet. The appearance and feel of natural down are imitated, with the added durability and compactness of synthetic insulation.