Vintage 1970s Thermal Logger Socks - Crimson1970's Logger Thermal Socks by Filson. DESCRIPTION A heavy weight boot sock with thermal insulation to keep feet warm in frigid temperatures. FEATURES High wool content for warmth Contoured rib top keeps sock up Smooth, flat toe seam minimizes rubbing High cushioning for shock absorption and warmth Wool will continue to insulate even if wet Elastic ribbing in the cuff and leg provide a relaxed stretch fit ITEM NO. 20075578 MATERIAL50% merino wool +