Neoprene knee braces are one of the most popular types of knee brace on the market. Like all braces they provide good support to the knee joint reducing pain and instability. The added advantage of the neoprene material is that it retains heat, which helps promote healing and reduces swelling and pain. Neoprene is the best material out there at retaining heat and insulating. Neoprene is made from synthetic rubber and is commonly used in wetsuits. It works by preventing heat from escaping, thus trapping the heat next to your body, even during periods of inactivity. This increases the blood flow to the knee which promotes healing.