Ethylene Vinyl Acetate sole SOFT, SPONGY, AND ELASTIC SOLE: produced with EVA, rubber-like flexibility and softness. Extra soft texture and elastic design complement the natural movement of your feet. SPACIOUS INTERIOR: Loose-toe design prevents pinching and blisters - perfect for all-day use and suitable for long-distance walking, travelling. SPAIN-INSPIRED CURVED DESIGN: Edge of the sole imitates handmade design with fashionable 3D depiction of Spain. BREATHABLE KNIT MATERIAL: Upper portion of the shoe is made of soft and flexible knit material with a breathable design to reduce odor and promote a comfortable and gentle fit. SIZING TIPS: Loose-toe design offers extra room for your toes; we recommend those with thin feet choose a SMALLER size.