Kjus Gemini Jacket ($549)
A phone doesn’t have to be a player’s only smart device; now a jacket can be smart, too. The Gemini is a reversible jacket that completes Kjus’ rain series. When worn with the dark side facing out (either black or navy), the waterproof, breathable and windproof fabric absorbs 99 percent of all external ambient heat and pushes it inside the jacket. The light side (gray) facing inwards traps in the heat, reflecting it against the body. This technology increases the jacket’s internal temperature by up to 10.2 degrees Fahrenheit more than when the product is reversed with the light side out. It also is available as a vest.