DERA Launches the B01, a Dial-Fit Running Belt Built to Carry a Liter of Fluid Without Bouncing

What Is the DERA B01?

‍DERA has launched its debut product, the B01 Trail Running Belt, the first release from a new brand built specifically around trail-running accessories. The belt is designed to solve the two things runners complain about most with hydration belts: bounce and bulk. It uses a dial-fit closure instead of a traditional buckle or strap, letting runners tighten the fit evenly around the body without breaking stride.

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Why Bounce Happens in the First Place

‍‍Most running belts loosen unevenly over the course of a run, shifting as fluid weight moves and body temperature changes. That's usually the actual source of chafing and bounce, not the belt's size to begin with. DERA's dial-fit system addresses this directly, tightening evenly around the entire belt so runners can adjust the fit mid-run without stopping or fumbling with a strap.
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Built Around Real Mileage

‍DERA tested the B01 on race distances from 11 miles to 62 miles, positioning it toward ultra-distance and longer trail efforts rather than short road runs. A few specs behind the build:

• Two co-developed 575ml HydraPak flasks. Fits up to two, giving runners over a liter of fluid capacity with room left for gels, a phone, and a layer.
• UHMWPE grid stretch fabric. A blend of 69% nylon, 21% polyethylene, and 10% elastane, built to resist abrasion and punctures while staying soft against skin.
• 108g to 130g depending on size. Weighs about 4.2oz in a medium, light enough to disappear during a run.
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Storage Built for What Actually Gets Carried

‍The belt separates front and rear storage rather than treating the whole thing as one pouch. A rear pass-through sleeve holds poles or an extra layer with gripping elastic bands and adjustable pull tabs, while a water-resistant stash pocket and external zip pocket keep smaller items like salt tabs, a car key, or cash accessible without digging through the main compartment.
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Availability

‍The DERA B01 Trail Running Belt is available now at dera.com for $129, in Granite White, sizes XS through XL. Several sizes are already sold out.