Period-proof any swimsuit with UnderSwim: Eltee Sydney's Invisible Swim Period Underwear for Girls. Firm fit to stay in place. If she's between sizes, size up.

• Period Protection, Not Water Absorption: Her swim undies absorb her period, while the outer fabric repels the water she's swimming in.
• Super Discreet: Seamless edges and high leg rise that sits on her hips and stays hidden underneath any swim fit that has full bottom coverage.
• Packaged in Waterproof, Resealable Pouch: For easy worn storage when she's out and about, and needs to change.
• Chlorine Resistant Coating: Fabric sealant creates water proof barrier, conserving integrity of the garment.
• Quick Dry: Stay comfy and dry and fully protected in and out of the water.
• Mighty Absorption: Ultra absorbent layer holds the equivalent of 2-3 tampons without adding any bulk.

Now she can hit the beach, chill out poolside or master your metres without a second thought.

Model wears size 14-16/W8.

Girls Period Swim Underwear are sealed for hygiene reasons. Returns only accepted if the hygiene seal is intact (unless deemed faulty).