The worst fabrics for hot weather are generally heavy, non-breathable synthetic fabrics that trap heat and moisture against your skin. Polyester is at the top of the list, especially polyester satin, polyester fleece, and thick polyester blends. Polyester is a plastic fiber made from petroleum, it is hydrophobic and does not absorb sweat, it does not allow air to circulate, and it creates a greenhouse effect around your body, making you feel hotter, sweatier, and more prone to odor and chafing. Other bad choices for heat include nylon, acrylic, vinyl, and faux leather, which are also synthetic and non-breathable. Heavy fabrics like thick wool, velvet, corduroy, and flannel are also terrible for summer because they insulate and hold heat. Even within natural fibers, heavy denim can be uncomfortable. The best fabrics for hot weather are lightweight, breathable, moisture-wicking natural fibers like 100% cotton, linen, hemp, and lightweight silk or silk blends, as well as performance fabrics designed to wick sweat. If you want to stay cool, avoid anything labeled 100% polyester, especially tight-fitting polyester satin or double-knit polyester.
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