This high-performance thermal base layer set features a long-sleeve compression top and matching full-length leggings, engineered for cold-weather training and outdoor activities. The black set includes strategic mesh ventilation panels under the arms and along the sides for enhanced breathability, while the main body utilizes brushed fleece-lined fabric (as highlighted by the '加绒 保暖' flame graphics) for superior insulation without bulk. The top has subtle white geometric branding on shoulders and chest, with a hexagonal pattern detail near the sleeve cuff. The leggings feature a wide elastic waistband with 'COMBAT PRO CO' lettering and reflective silver side stripes for visibility. Both pieces offer 4-way stretch for unrestricted movement, moisture-wicking properties to keep skin dry, and seamless flatlock stitching to prevent chafing. Ideal for gym workouts, running, hiking, or layering under outerwear in fall/winter conditions. Designed for men seeking functional, form-fitting activewear that balances warmth, compression support, and modern athletic aesthetics.