Stretch engineered knit upper with a round toe BLOOM materials: Eco-conscious algae-infused foam layer under the insole BZEES Air Step 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, 1 3/8 inch platform, 1 5/8 inch heel