Long Sleeve Flight Engineered Crew Size: MENS L Color: Pamphlet Blue New with tags, stored item No noticeable scratches or damage. Autumn/Winter high-performance running wear This product is no longer sold. Unusual running wear with knit-like elasticity. Looks like a North Face sweater. This is technical wear for trail running, designed for efficient temperature regulation inside the garment based on exercise physiology. It uses a medium-thick material with a mesh structure mapped to areas with high perspiration. While promoting ventilation inside the garment, it also provides moderate heat retention, making it suitable as thermal wear for running, and can handle temperature changes due to altitude and weather, as well as nighttime activities in low temperatures. The neck area has a free-cut design, and the body is made with a circular knit to reduce skin irritation. The cuffs are slightly longer with thumbholes. It is treated with Polygiene, which provides antibacterial and odor-resistant effects with silver ions. It is designed with electrostatic care to suppress the generation of static electricity. Reflective logos are used for nighttime visibility. Manufacturer Item Number: NT12274 Thermal Vent Warp Knit (45% Polyester, 45% Nylon, 10% Polyurethane) Front and back reflective logos Highly absorbent knit structure Polygiene treatment (antibacterial and odor-resistant treatment with silver ions) Electrostatic care design to suppress the generation of static electricity Sleeve: Long sleeve Gender: Men Features: UV protection, deodorization