This item was purchased last year and is unused. It's labeled as L, but the Asian size is XL. Thank you. The tag was originally pinned on, but I removed it because it seemed like it might snag. Lightweight and breathable long-sleeved T-shirt made of polyester. Mountain Hardwear AirMesh Long Sleeve Crew Features: [International Size] This long-sleeved shirt is lightweight, compact, and versatile as a layering piece throughout the year. It uses 100% Teijin "Octa," a special polyester material with a loft and heat retention that is half the weight of regular fibers. It can be used in various ways, such as worn alone when climbing or as a mid-layer on ridgelines. ● Excellent breathability and heat retention due to the brushed lining and ventilation mesh processing ● Crew neck ● Side seams designed to prevent chafing ● Thumbholes ● MHW logo on the front left chest Octa A polyester fiber with an octopus-leg-shaped cross-section, with a hollow core and eight protrusions arranged radially. It combines various functions such as sweat absorption and quick drying, lightweight, heat shielding/insulation, and bulkiness, surpassing conventional hollow fibers. Thank you for looking.