Built to aid in active recovery and for everyday wear; Design features a polyester fleece upper for a soft and comfortable fit; Designed to be worn without socks, Topo's 3D Wave Sense Insole gently massages the bottom of the foot; Vibram XS Trek EVO outsole offers optimal multi-surface traction and durability for year-round wear; Topo Athletic's mid-level drop provides a near neutral platform for a more natural running experience; Anatomical toe box allows toes to spread naturally and comfortably; Stack Height: 23mm (heel) // 20mm (forefoot); Heel to Toe Drop: 3mm; Weight: 6.5oz (W7)