Fit Our Men's Tru-Fit Sizing delivers a true-to-size fit, setting us apart with precision and comfort. Product Overview The Ultimate Blend of Style and Performance: The Catalyst Mountain Bike Button-Down Shirt! It's a button-up shirt with a twist—it's actually a high-performance jersey in disguise, combining classic charm with functionality. Built in our ultra stretchy, lightest weight and most breathable fabric and packed with features like a front stash pocket, a built-in lens wipe, and strong reinforced snaps. Specs and Features Made with our ultra stretchy, lightest weight and most breathable fabric Recycled Ion Pro Premium Fabric Blend: 78% Polyester / 16% Spandex / 6% Silver Ion for superior performance Using silver-based antimicrobial control helps to diminish odor-causing bacteria, resulting in a refreshing feeling and a natural cooling effect on the skin. Verified Cooling Effect: Experience natural cooling with 6% Silver Ion content. Certified by a trusted third party for its effectiveness, this element allows for more airflow and breathability on the skin. Relaxed fit with longer back hemline for added comfort and coverage Integrated lens wipe, ensuring convenient and quick cleaning of your eyewear whenever needed Hidden zipper pocket on the bottom left backside of the shirt for secure storage Reinforced snaps for enhanced durability during intense rides Ultra stretchy, Lightweight and highly ventilated Ion Pro fabric keeps you cool and comfortable Eco-friendly ink printing for minimal environmental impact Optimized for on-bike fit, allowing freedom of movement without compromising style or performance UPF30 sun protection rating safeguards against harmful UV rays