Super-cute and pratical! No other swim nappy is necessary.  No bulky fabric and extra snaps, this swim nappy  is cute enough to wear alone, but slim enough to wear under a standard baby swimsuit.  The wicking liner helps prevent nappy rash, the inner absorbent layer helps protect against messes outside the pool, and the waterproof outer layer works with the snug-fitting waist and legs to provide secure protection from accidents in the pool. A snug fit is necessary to ensure no accidents! See below for sizing info. Fabric: Knitted polyester shell; Polyester lining 06mo (3-6m): weight 4,5-8kg, waist 44,5-47cm, leg 21,5-25,5cm12mo (6-12m): weight 8-10kg, waist 47-49,5cm, leg 24-28cm18mo (12-18m): weight 10-11,5kg, waist 49,5-51cm, leg 25,5-29cm24mo (18-24m): weight 11,5-13,5kg, waist 51-53cm, leg 26,5-30,5cm3T (2-3y): weight 13,5-17kg, waist 53-54,5cm, leg 29-33cm4T (3-4y): weight 17-21kg, waist 54,5-56cm, leg 30,5-34cm