Soft - charlie banana’s ‘signature’ softness comes from tencel lyocell, a unique sustainable material designed for natural comfort.. simple - our swim diapers come in 4 snug sizes. no disposable diaper needed. go swimming, throw it in the wash and reuse again and again. sustainable - tencel lyocell is produced from sustainably sourced wood, through environmentally responsible processes. all charlie banana products are climate neutral certified. we commit 1% of our sales to tackle climate change and support environmental causes through 1% for the planet.