Size Chart	One Size
CM	71-115
INCH	28-45

NB400 Groove

The nerd belt NB400 Groove is a lighter version of the bestselling NB600 Groove, offering the same secure, no-bounce fit with a compact 400ml fluid capacity. It includes two ergonomically shaped 200ml Groove bottles, giving you a simple, hands-free way to carry hydration during training and racing.

Lightweight hydration belt with a secure, no-bounce fit
Includes two ergonomically shaped 200ml Groove bottles
Carries up to 400ml of fluid
Silicone fit-lock pieces help prevent the strap from loosening
Large pouch fits most phones, keys and race nutrition
Integrated race bib holder
Adjustable strap fits hips measuring 71 to 115cm

NB400 Groove

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About NB400 Groove

The stretchy, adjustable neoprene strap fits hips measuring 71 to 115cm, while silicone fit-lock pieces help keep your chosen fit securely in place. A premium honeycomb back material improves comfort against the body, helping the belt remain comfortable and stable at any pace.

Alongside the two bottles, the larger storage pouch has space for your phone, keys and race nutrition. It can carry more than six energy gels or four packs of chews, while the integrated race bib holder keeps your number secure without using safety pins.

Designed for everything from everyday training and half marathons to Ironman events and ultra running, the NB400 Groove keeps your hydration and essentials within easy reach. Each belt is supplied in a sleek, branded zip-lock bag.

How does it work

The NB400 Groove uses a stretchy, adjustable neoprene strap to sit securely around the hips. Its silicone fit-lock pieces hold the strap adjustment in place, while the honeycomb backing provides a comfortable contact surface. This combination helps reduce unwanted movement and bouncing as your pace changes.

The two 200ml Groove bottles contour to the shape of your hips for a smoother fit and easy access to fluids. The central pouch keeps your phone, keys and nutrition close to the body, while the race bib attachment provides a simple way to display your number on race day.

About nerd belt

nerd belt was created by professional triathlete and multiple-time IRONMAN champion Steve McKenna, who wanted a better way to carry hydration and fuel while running. Designed to perform at any pace with zero bounce, each belt comfortably carries 400–600ml of fluid alongside essentials such as a phone, gels and bars.

What began as a single belt made for Steve’s own training quickly grew into Australia’s number one-selling hydration belt. Today, nerd belt continues to help runners and endurance athletes stay fuelled, hydrated and comfortable throughout training and racing.

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