These little Fresh Sugar Lemon Sugarbath Cubes ($39) feel like a mini science experiment when you drop them in the tub. Formulated with a bicarbonate of soda, the cubes create bubbles the minute they hit the water and release swirls of nourishing oils that pamper the skin when dropped in a warm bath. The cubes are also enriched with real brown sugar, which aids in the healing and leaves skin supremely supple postsoak.