The Charlie Banana Reusable Swim Nappy has a light, waterproof outer and a soft and absorbent Tencel® (Lyocell) lining. Lenzing Tencel® is highly absorbent and naturally antibacterial. Soft against your child’s skin. Sizing for the perfect fit, adjustable waist ties for extra security. Just ensure the leg elastics are firm (not tight) .Available in three sizes to fit from 4.5 kg up to 12kg.Small 4.5 kg - 6kgMedium 6kg - 9 kgLarge 9kg - 12 kg