Di2 Battery BT-DN300 Hydration This FINA-approved style smoothes the

This FINA-approved style smoothes the body into a streamlined shape from the waist to the knees with the added benefit of no stitching for zero chafing and dragging

The KOO Supernova have a versatile design for running

Hands fit firmly and don’t slip in the water

Weight: 128 g

Waterproof Commuter Footwear Protection

Di2 Battery BT-DN300 Hydration This FINA-approved style smoothes theThe new DN300 battery features the same waterproof design that Di2 users have loved for generations. Now with 3 ports, it delivers stable power to Shimano's 12 speed road derailleurs and shifters (if a fully wired option is selected). With the same size as its predecessor, the slim DN300 battery can be housed inside seat posts or frames ensuring a clean aesthetic. Now with 3 ports, the DN300 simplifies wiring to front and rear derailleurs, supplying