Used twice. Speedo Biofuse Training Fins Flippers in UK Size 10-11 are high-quality swimming flippers made of durable rubber material. Designed by the reputable brand Speedo, these flippers are suitable for both men and women and feature a round toe type for optimal comfort and performance in the water. With a sleek black colour and originating from China, these flippers are perfect for snorkelling, mask training, and other water sports activities, making them a great addition to any swimmer's gear collection.