1. Wool: Wool is arguably the most popular natural fiber material for socks. Wool socks are very comfortable and warm, and wool also has cushioning properties, maintaining warmth even when wet. However, a major drawback of wool is that it doesn't dry easily. Also, if you're not used to wool, it can cause itching. Fortunately, many wool socks have avoided this drawback. Wool is more prone to wear and tear compared to other materials. Most wool socks incorporate synthetic fibers, eliminating these drawbacks.
2. Synthetic Fibers: Research shows that synthetic fabrics also have excellent warmth retention, almost identical to natural wool. Furthermore, synthetic fabrics are softer and more comfortable against the skin. They dry faster and are more durable than natural fabrics.
3. Silk: Silk is a natural insulating material, very comfortable and lightweight. One thing to note is that this material is not very durable, so it's usually blended with other fabrics to make inner socks.
4. Cotton Fabric: Generally, 100% cotton fabric is not used to make socks for outdoor sports. This is because you sweat easily during exercise, and while cotton absorbs sweat well, it doesn't dry easily. Wet fabric is very uncomfortable and can cause blisters. However, because dry cotton has a very comfortable feel, it can be used in combination with wool or insulating fiber fabrics for lightweight outdoor activities in summer.
