Nathan Women's AeroZip Hydration Vest 1L Size:Medium 3D Shapes- The irregular shape

3D Shapes-  The irregular shape of the core is of great importance for the overall torsional stiffness of cross-country skis and their weight reduction

designed to expertly regulate your body’s microclimate when you’re working up a sweat

Designed with a relaxed fit that moves with you

smooth-riding experience that handles groomers with confidence without sacrificing performance

skim-inspired feel

Nathan Women's AeroZip Hydration Vest 1L Size:Medium 3D Shapes- The irregular shapeUltra Light. Ultra Snug. Zero Distraction. The AeroZip 1 Liter Women's Hydration Race Vest is engineered for the female athlete who demands a minimalist, aerodynamic fit. Designed to move seamlessly with your body, this vest strips away the bulk to provide a "barely there" feel that stays secure mile after mile.