Brand: Bopika Style: Summer Outdoor Water Shoes For: Beach Swim Surf Yoga Exercise, etc Package Include: -1* Water shoes -1* Free waterproof case for cellphone Size Chart： 9-10.5 M US Little Kid = Insole Length 7.08 in/18 cm=EU26-27 11-11.5 M US Little Kid = Insole Length 7.48 in/19 cm=EU28-29 12.5-13 M US Little Kid = Insole Length 7.87 in/20 cm=EU30-31 1-2 M US Little Kid = Insole Length 8.27 in/21 cm=EU32-33 2.5-3.5 M US Little Kid = Insole Length 8.66 in/22 cm=EU34-35 S: (Women:5.5-6.5/Men:4-5) = Insole Length 9.06 in/23 cm=EU36-37 M: (Women:7.5-8.5/Men:6-7) = Insole Length 9.45 in/24 cm=EU38-39 L: (Women:9.5-10.5/Men:7.5-8) = Insole Length 9.84 in/25 cm=EU40-41 XL: (Women:11-12/Men:9-10) = Insole Length 10.24 in/26 cm=EU42-43 XXL: (Women:13-14/Men:11-12) = Insole Length 10.63 in/27 cm=EU44-45