Ultraspire Quantum 2.0 Waist Pack | Minimalist and Super Lightweight Running Belt FEATURES - Multiple reflective details; longer zipper in the main compartment to accommodate electronics; built-in clips for race bib attachment that tuck away when not in use MAX O2 WAIST - Attachment system with greater recoil for better range of movement CARRY EVERYTHING YOU NEED - Rapid access pocket and let the consumer decide what goes in, such as gels, energy foods, pills, electrolytes or keys PERFECT FIT - Comes in 3 sizes to ensure a perfect fit: Small (Chest Size: 25"-33"); Medium (Chest Size: 29"-37"); Large (Chest Size: 34"-43") RECOMMENDED USE - For daily training essentials; half marathon to marathon with water stations Stretch mesh fabric belt for lower pack weight and huge cooling and breathability! Soft touch perimeter edging with beautiful de-bossed logos for a polished look, and a nonrestrictive feel. Max O2 Waist attachment system with greater recoil for better range of movement. Now with Magnon Electrolyte Pocket Built-in clips for race bib attachment that tuck away when not in use. Longer zipper on main compartment to accommodate electronics. Multiple reflective details.