Sweat is not an eczema sufferer’s friend. Sweat is your body’s mechanism for cooling down. When you’re hot, your skin releases moisture that evaporates, causing you to cool down. However, The National Eczema Association explains that that process dries out the skin and makes eczema worse. For this reason, synthetic fabrics like polyester, nylon, and rayon are problematic. They do not allow the skin to breathe, which causes you to sweat. If you have eczema, it’s best to stick to natural fabrics like cotton or linen and, when possible, loose-fitting garments that allow the skin to breathe. These are the most comfortable on hot days, too, so it’s a win-win.