Silly socks for adults provide warmth by trapping air in the weave of the fabric. For example, just like how a well-made winter coat traps heat in and keeps you warm, so do well-made socks. A thin cotton sock will keep your feet warm, while a plush wool one is perfect for those colder days. When looking for an adult sock from Madmia, find ones that fit snugly as this provides insulation. If you have cold feet or toes, you need to wear two pairs of socks at once or try wearing them without shoes.