TOPCHAMCES(TM) Rubber Swim Training Fins Flippers for Men, Women and Kids, Short Training Fins for Swimming Material: silica ge ,Colour:balck ,yellow ,blue, orange Size:Available in sizes S to XXL Rubber swim fins ideal for swimming laps or snorkeling The feeling like, greatly increased the fun of swimming Freestyle, butterfly, backstroke, improve ankle flexibility, improve the kick To improve leg strength