FEATURES Engineered for swimmers at any level that are looking to decrease times and improve performance Designed for swim training and exercise regiments to increase leg strength and foot flexibility Constructed of 100% natural rubber Sizing: based on shoe size XXXS (Kid’s 12-1) XXS: (Kid's 1-3) XS: (Men’s 3-5, Women’s 4.5-6.5) S: (Men’s 5-7, Women’s 6.5-8.5) M: (Men’s 7-9, Women’s 8.5-10.5) L: (Men’s 9-11, Women’s 10.5-12.5) XL: (Men’s 11-13, Women’s 12.5-14.5) XXL: (Men's 13-15, Women's 14.5+)