MATERIAL: Made of TPR,which is lightweight,soft,flexible and durable FLEXIBLE: Short blade creates a faster kick tempo and helps build proper leg strength with the least muscle discomfort,improves kicking mechanics and efficiency.Closed ankle provides extra support. COMFORT: Elastomer foot pocket improves comfort,easy on and off.Closed heel design reduces chance of hyperflexion of the ankle SAFETY: The underside of the foot area has a non-slip tread pattern which makes walking round the pool less hazardous, and also means that tumble turns and diving are safer too.