UltrAspire | Speedgoat 4.0 Long-Distance Hydration Running Belt

Low Center of Gravity for Uninhibited Trail Stability

When you are tackling ultra-distance training blocks or navigating highly technical singletrack, minimizing upper-body weight can drastically reduce muscle fatigue. Designed in collaboration with legendary ultrarunner Karl Meltzer, the UltrAspire Speedgoat 4.0 Running Belt is the pinnacle iteration of his signature waist pack. By keeping your gear and fluids anchored tightly around your waist, this pack maintains a remarkably low center of gravity. This bounce-free engineering ensures your core remains stable and your momentum stays entirely uninhibited, allowing you to conserve vital energy over multi-hour backcountry outings.

Ergonomic Twin-Flask Hydration Architecture

Sustaining your pace through remote miles requires fluid access that doesn't disrupt your running mechanics. The Speedgoat 4.0 comes equipped with two premium UltraFlask 550 Hybrid Bottles housed in specialized, insulated holsters that keep your water or electrolyte mixes cool for extended periods. These holsters are angled and ergonomically positioned at the back of the hips, allowing for lightning-fast, blind retrieval and stowing on the fly. This smart rear mapping keeps the bottles completely clear of your natural arm swing, removing the risk of chafing or rhythm disruptions.

Intelligent Storage Layout with Fast Z-Pole Access

Despite its streamlined, low-profile fit, this one-size-fits-most powerhouse offers a highly organized equipment payload. An upgraded, larger-capacity zippered front pocket is custom-sized to secure oversized cell phones, keys, or lightweight emergency gear. Flanking the hips, deep zippered side pockets and a 4-way stretch mesh compartment isolate your nutrition and gloves, while quick-stash mesh sleeves on the holsters hold empty gel wrappers. When the terrain flattens out, integrated front Z-pole attachments let you securely lash or retrieve trekking poles on the move. Finished with a re-engineered aluminum buckle for effortless, reliable adjustment, this belt is built for complete trail self-sufficiency.

Premium Performance & Technical Features

• Signature Low-Drop Stability: Low center of gravity layout anchors your gear securely to eliminate vertical bounce and torso friction.
• Dual UltraFlask 550s Included: Comes complete with two 550ml hybrid soft bottles that are entirely BPA-free and easy to squeeze on the move.
• Insulated Hybrid Holsters: Rear hip holsters feature thermal lining to shield fluids from body heat and keep drinks cold longer.
• Upgraded Aluminum Buckle: Rugged, lightweight aluminum closure system ensures a reliable fit that won't slip or loosen under load.
• Rapid Z-Pole Attachments: Specialized exterior loops allow you to stow or deploy folding trekking poles without stopping your watch.
• Oversized Phone Storage: Expanded high-volume front zippered pocket easily accommodates modern large smartphones and essential electronics.