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smart wool

British  

noun

  1. a textile produced by blending wool with a conductive fibre, which can be heated by means of a small battery

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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VF Corp. owns dominant winter clothing brands including North Face, Smart Wool and Timberland.

From US News

I stood before the rows of smart wool, cotton and Lycra for a good five minutes before a sales guy trudged over to help.

From Forbes