Tag is ripped off, but it’s a size large, basically like new. I’m a small and I wear it, but it’s just loose rather than the typical form fitting base layer from smart wool. I’d say best for a medium or large! Description from smartwool website: With floral patterns and even more functionality, Women's Intraknit™ Thermal Merino Base Layer Pattern Crew is engineered to enhance your performance with lighter weights and a cleaner finish. This Smartwool® base layer is 3D-mapped for a near-custom fit and freedom of movement, while ribbed elbows provide extra flex room. New technology allows us to seamlessly knit mesh ventilation in gender-specific zones designed to help keep your body dry and warm as you zip up and venture out in comfort.