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This HydroKnit pack celebrates the UCI Mountain Bike World Series and all the incredible riders competing
Buttery Bros superfans need this pack
Engineered with an ultra-soft backing and microfilament yarn for enhanced comfort and durability
Made with our premium SuperKnit material
4.0 Saved By the Butter SuperKnit Band training This HydroKnit pack celebrates theGet it while it's hot. The extra buttery new band brings the fun to high intensity days and recovery days. Designed in collaboration with the Buttery Bros, its colorful and full of personality, just like the iconic duo. Slide on the first of its kind, butter inspired translucent battery to complete the look. Includes Band, Hook, Clasp, and Fast Link slider that makes swapping bands easier than ever. Only compatible with WHOOP 4. 0. Design variation