2 Pairs of Muk Luks Heat Retainers MENS 2.3 Tog Rating Thermal Socks. Fit shoes size 10-13. Heat Retainers offer superior insulation, comfort and advantages over regular thermal socks. High density yarn. Soft, plush and durable. 2.3 Tog rating. Your feet stay warmer and for a longer period of time Beautiful Nordic/Caribou/Moose design in gray palette. New with tag, without defects. Thank you.