Crew Neck Long Sleeve Undershirt Set 92% Polyester 92% Elastane Top and bottom undershirt set: Provides extra warmth and comfort in cold weather. Crew neck design: Offers a simple and comfortable look for everyday use. Long-sleeved top: Keeps the body warm and protects against cool weather. Soft and flexible fabric structure allows for comfortable use all day long. Thanks to its body-hugging shape, it can be easily worn under clothes. It is an ideal undergarment for daily use, outdoor activities and winter months. Thanks to its durable structure, it retains its shape for a long time.