The BESTSELLING and HIGHEST REVIEWED swimmable mermaid tails in the world. REVOLUTIONARY patented Tip Reinforcement Technology PROTECTS the tips of your tail from holes, tearing, & shredding. No need for tip protector tape! 82% polyester/18% spandex. SWIM FASTER with the included PATENTED Fin Fun Monofin in the pool or ocean. ENGINEERED Fin Fun Monofin creates a natural mermaid motion with an unbreakable fin and neoprene cover.