Mermaid Tails from Planet Mermaid in the UK - Buy, Wear and Swim in a Real Mermaid Tail Costume. We make dreams come true for thousands of Little Mermaids in the world. Free UK Shipping. Our Mermaid Tail designs are handmade using only high quality 80% Nylon and 20% Spandex Swimwear. We also sell a wide range of Mermaid gifts from leading swim wear manufacturers - Monofins, Flippers, Swimsuits, Goggles and more. Now you can truly swim like a Mermaid, whether it be in the sea, swimming pool or just splashing about in the bath tub at home. This really is a great opportunity for your little ones to have their dreams and wishes come true!