WHAT IS IT? A multi-action booster serum with a fresh and light texture, La Solution+ Fermeté restructures, tones and strengthens the skin to fight sagging. With a high concentration of active ingredients, this body serum restores collagen and tightens skin tissue. WHY WE ADORE IT? Attention haute hippies: This is one of those eco-friendly brands that's easy on the planet and looks chic. We can't get enough of the simplified range of products, each with a blend of natural and organic ingredients. While it's no substitute for diet, exercise and good genes, this caramel-colored serum helps to smooth and tone areas that are, ahem, not as tight as they used to be (like the bust, thighs, stomach and butt). You don't have to massage it in forever like other firming creams-just apply it to your problem spots and let it sink in.