Live out your underwater fantasies with swimmable mermaid tails from Swimtails. Made with high-quality, durable, 4-way stretch swimsuit fabric. We custom tailor your mermaid tail to your exact measurements. Combine with our sleek and powerful monofin for a true mermaid experience. Includes some of our most popular designs from 2016-2018 Made to fit Finis Brand Monofins. Available in Child & Adult Sizes.