When chilly temps arrive, you will be covered to be warm and cozy inside and outside. This Women's 6 Pair Pack of socks by MUK LUKS as 2 Heat Retainer Crew Socks and 4 pairs of Microfiber boot socks. Heat Retainers by MUK LUKS have advanced thermal heat retaining technology and high-density yarn construction, these super soft socks will keep toes toasty no matter what. The Microfiber boot socks are the perfect amout of warmth and cozy for lounging in the house or in your favorite boot! Machine wash cold. Only non-chloring bleach when needed. Dry flat. - 91% Acrylic, 8% Polyester, 1% Spandex Knit - 2 Pair Pack - Extra thick construction and high-density yarn - Advanced thermal heat retaining technology for additional warmth - Multiple Color Options - One Size