Sheets that are 100 percent cotton are an inexpensive and easy-to-find choice for the warmer months. This natural fiber is breathable and light, so hot air is released through the fabric. It’s also absorbent, so sweat is wicked away from the body. Make sure you choose sheets that are 100 percent cotton — no synthetic materials — and have a good thread count. Any thread count above 250 is decent, but 500 to 1,000 is considered the best.

Cost: About $8 to $75, or higher depending on thread count