The most flexible ballet flats. Perfectly packable and lightweight, you won't have a problem fitting these into your suitcase. Stretch engineered knit upper with a round toe. Bloom materials: algae-infused foam layer under the insole. Bzees Cloud Technology: Designed so you'll feel weightless, energized and free. Ultra Lightweight: Step lightly with a nearly weightless feel. Dynamic Stretch Fabrics: Move freely in shoes with built-in stretch. FreeFoam Comfort: Low pressure insoles with maximum foot contact and cushy arch support. SoCush arch support.