Product Overview and Features Shark EVA sandals are characterized by their cute, shark-like design, as the name suggests, and are mainly made of EVA material. Material: Primarily uses EVA (ethylene-vinyl acetate copolymer) material, which is lightweight and flexible. Comfort: Provides a soft feel that reduces stress on the feet, making them less tiring to wear for extended periods. Some products have uneven insoles to improve breathability or provide a massage effect. Uses: Water-resistant and washable, making them suitable for various situations such as leisure activities at the beach or pool, bathrooms, verandas, and indoor wear. Design: Many have a platform design, offering both a style-enhancing effect and ease of walking. Size Guide Size "40-41" generally corresponds to a range of approximately 25.0cm to 26.0cm, but there may be variations depending on the manufacturer and product. Examples of general size correspondence are as follows: EU Size (40-41) Japanese Size (Approximate) 40: Approximately 25.0cm 41: Approximately 25.5cm 40-41 (for common size notation): Approximately 24.5cm or Approximately 26.0cm Important Notes: For overseas products, the size notation may differ from Japanese size notations, so be sure to check the inner dimensions (cm) on the purchase website. EVA material may deform or shrink if left in a high-temperature environment (approximately 50°C or higher) for an extended period, so care should be taken when storing them in a car during summer or in direct sunlight.