Care for a side of caffeine with those legging? That's just one of the ingredients built into Proskins Slim, which aim to reduce fat. Along with Vitamin E and Retinol, caffeine is said to increase circulation and thus help reduce the thunder in your thighs. It may sound crazy, but independent tests appear to have proven some of these claims. What's your take--would you pay $120 for a pair of leggings that slim your legs?