Hot sleepers should choose beds known for their cooling materials that don’t hug the contours of the body:
Stay away from beds with soft, thick memory foam top layers that tend to hug around the body, making you hotter. Latex upper layers, gel or gel infused are much cooler and thinner layers of memory foam are okay.
Take a look at new innovations in cooling technology, like cooling adjustable bases, air channels between layers and new materials in top layers and covers. Mattress have come a long way in recent years in terms of materials and there is plenty out there geared for the hot sleeper.
Choose moisture wicking, cooling and antibacterial covers and avoid anything vinyl, synthetic or materials that don't breathe. Wool, cotton or Tencel are great options.