75% acrylic, 15% polyamide, 7% merino wool, 3% elastane Acrylic for long lasting buttery softness, Polyamide used for reinforced heels and toes for increased strength and durability, merino wool for added warmth and moisture absorption. Medium is suitable for: Womens US shoe size 6-9 / Mens size 5-9. Large is suitable for: Womens US shoe size 9-14 / Mens size 10-12. Made in Ukraine.