evo.com | Smartwool Jerseys > The Smartwool Mountain Bike Short-Sleeve Jersey harnesses the temperature regulating powers of merino wool with targeted mesh zones for ventilation in key zones. The regular fit gives you room to move, and the exaggerated drop tail offers superior coverage when you're bent over the bars - perfect for mountain bikers with their eyes on the prize. Regular Fit Room to move without additional bulk. Drop Tail for Extra Coverage Main Body 56% Merino Wool / 44% Polyester Inset Panels / Back Body 38% Merino Wool / 33% Lyocell / 29% Polyester Targeted Mesh Zones for Increased Breathability | Smartwool Mountain Bike Short-Sleeve Jersey 2026 - Large in Navy | Wool/Polyester