Your best bet is to go with percale sheets, which feel crisper and cooler to the touch than sateen or other materials. We recently tested a variety for our roundup of the best cotton sheets, and the Milano Hemstitch Sheets by Matouk came out the winner. These are 600-thread-count Egyptian cotton, which is softer and more durable than standard cotton. Percale does feel stiffer than sateen at first, but over time, as you wash it, becomes silkier. If you're willing to spend more, Sferra's Giza 45 Percale Sheets are exceptionally smooth, lightweight and breathable, with a beautiful stitched detail. —Betsy Goldberg, editorial director at Buy Side from WSJ