Introducing nerd’s hydration vest, the NVlite. The nerd vest has incredible feedback and after 12 sample runs over 2 years of testing is ready to go. Problem = Vests make me sweat to much Solution = NVlite SIZING Available in 5 sizes – ranging from XS-XL. We recommend sizing down if you’re between 2 sizes. (e.g. 97cm Chest Circumference is better in size small because our durable mesh backing and soft hem can stretch to fit) XS: 82 – 92 S: 92 – 98 cm M: 98 – 104 cm L: 104 – 110 cm XL: 110 – 119 cm KEY FEATURES Breathable fabric: designed from the highest-quality, lightweight materials, that delivers breathable, stretchy comfort that keeps you cool. NO bounce: side elastic system to uphold our NO bounce reputation. Simply adjust the side elastic for a secure, custom fit at your waist. Accessible storage: accessible storage includes 2 x front pouches designed to hold and secure any size phone, plus a separate zip compartment to keep keys or valuables safe. Additional storage: a large, secure back pouch provides extra storage for your running essentials, including a spray jacket, 10–12 gels, and more.