Seac Speed-S short fins of size 42-43 perfect both for training legs in swimming in the pool, open water and for snorkeling at sea. Ideal For Beginners

The shovel and short fin shovel are made of 3 different plastic materials to provide thrust and resistance where needed. The ergonomic design of the closed shoe provides comfort and stability, for a fin to rest on the foot without causing discomfort

I actually never used them. Not even once. I made a mistake regarding the size and was never bothered to send them back. (preguiça)