Size: XL (US Male 9-11 / US Female 10-12. Like new. LONG BLADE DESIGN FOR ELONGATED KICK: Provides greater resistance in the water for maximum forward propulsion while improving swimming technique by teaching swimmers to kick from their hips and not their knees FLOATS IN FRESH AND SALTWATER: Buoyancy from the fins lifts legs to the surface, making it easier for swimmers to find correct body position GREAT FOR ALL AGES AND ABILITIES: Designed to increase leg strength and speed, building cardiovascular conditioning even for competitive swimmers SOFT, NATURAL RUBBER: Provides secure and comfortable fit compared to other swimming accessories