Finis Long Floating Fins Ideal training tools for the development of muscle and technique Long blade provides resistance in the water for maximum forward propulsion Buoyancy from the fins lifts legs to the surface, reducing drag from the rest of the body Adds power to your kick and builds leg strength Provides a secure and comfortable fit Fins float in both fresh and salt water Appropriate for fitness and competitive swimmers to build cardiovascular conditioning Closed heel provides extra support and easy on and off Floating Fins are color-coded by size-Black/Navy Men size 11-13 For more information on swim fins, read How to Choose Swim Fins Pre-owned very good condition. No noted damage.