Swim Secure's new bum bag includes a waist strap, and triple seal pocket. It is bright and is recommended for open water swimmers, equally it is great for use whilst running and taking part in triathlons. We have two colours to choose from: Orange and Black. Size 21.5cm x 15cm flat and empty The adjustable belt design clips securely around the swimmer's waist, and is very low drag (you generally don't notice it is there).  Please note, this is not a buoyancy aid, it does not give any buoyancy whilst swimming.  High visibility - Orange colour, or Black Extremely lightweight Ideal for training and events Triple seal water proof pocket Size 22cm x 15cm flat and empty Material, waterproof 30C TPU, the strap is 53*2.5CM, and can adjust to 85CM long.