【Product Details】 Workman's popular "THERMOLITE Eco Made Thermal Crew Neck" Perfect as an immediate-use innerwear for hiking and outdoor activities! With an ultra-lightweight design weighing only 126g and a crew neck style that makes layering easy, it's suitable for everything from everyday wear to serious mountain climbing. The THERMOLITE Eco Made material features a hollow fiber structure that balances excellent heat retention with sweat-wicking (breathability). You can move comfortably without stickiness even when you sweat. 【Comparison with Other Brand Materials】 Highly recommended for serious hikers! "THERMOLITE Eco Made," a representative material for high-performance active insulation, is similar to "Octa" and "Polartec Alpha Direct." These materials utilize hollow structures and mesh knits to provide heat retention, breathability, and quick-drying properties, with a common feature being their resistance to stuffiness during activity. You can comfortably wear Workman's THERMOLITE Eco Made!