Reusable swimming nappies are perfect for trips to the pool and to take on holiday. Baba & Boo’s nappies work in exactly the same way as the disposable variety but you can wash them, meaning you save...lots! In fact, their swim nappies cost less than three packs of disposables. There is no need for an additional nappy when your tot wears one of these nappies. Some baby swimming classes will insist that you use a reusable swim nappy. Swim nappies are not designed to be absorbent - they are designed to keep the poop in.