【Thermal Material】Welwoos heated winter socks are made of 92% Acrylic, 7% Polyester, 1% Spandex, which have thick layers, warm brush, comfortable touching and no itching issues. There are 3 pairs warm winter socks in one pack for men & women. 【Sizes】We offer 2 sizes as options for men and women, Medium and Large. Medium fits for UK shoe size 3-7. Large fits for UK shoe size 7-11. The warm insulated socks can fit different people for skiing, hiking, trekking, camping, hunting or daily wear. 【Keep Feet 7X Warmer】Designing with thick thermal brushed fleece inner, these warm heated socks can keep your feet warm for long time in winter or in the coldest environments. They are 7X warmer than cotton socks and have superior insulation for the extreme cold weather. Excellent ski boot socks for men and women! 【Stretchy & Cushioning】The warm thermal ski socks have high stretchy fabric to keep socks stable and improve blood circulation when you are exercising outdoors. Superior full cushioning can protect your feet better and keep feet more comfortable. 【Best Gifts for Men & Women】The winter insulated socks are best gift for men & women, they can be Christmas gifts, birthday gifts, Valentine’s Day gifts, Father’s Day gifts, Mother’s Day gifts or other holiday gifts.