First Endurance Hydration Mix Package type:Single Serving Birkenstock Cotton Rib Socks: Sustainable

Birkenstock Cotton Rib Socks: Sustainable Comfort with Classic Style

Versatile Design: Perfect for casual outings or everyday wear

engineered for long-term wear and consistent grip

& breathable performance

First Endurance Hydration Mix Package type:Single Serving Birkenstock Cotton Rib Socks: SustainablePREMIUM ENERGY & HYDRATION MIX Our award winning EFS mix has been redesigned to help you train and race like never before. Backed by science and packed with 30g of carbohydrates per serving, the new EFS formula redefines fueling to help you go further, faster. Increases energy & improves performance Clinically effective dose of all 5 electrolytes to prevent cramping & dehydration Isotonic for rapid rehydration Zero Artificial Ingredients