Panda Superstore Short Swim Training Fins Swim Fins Purple M(39~40) Soft advanced silicone short blade to help develop stronger, faster kick. Short, straight blade helps maintain proper kick/stroke tempo Super soft silicone foot pocket provides extended comfort and secure fit Closed heel design reduces chance of hyperflexion of the ankle. This Shoe Size Equivalent - Men's 5.5-6.5/Women's7.5-8.5. (Size and color can be chosed)