Armpit to armpit: 20 inches Top to bottom (back): 28.5 inches "Our Men’s Shoulder Stripe Perforated Vest is a must-have on the course. Made from a two-way stretch, quick-dry fabric sourced from Italy, it features perforated details for enhanced airflow, along with pockets for all your essentials. This versatile layering piece looks great over a sweater or under a jacket and is your perfect style for spring golf."