The Thermal Sets outer layer is 100% cotton that offers breathability and inner layer is 100% high performance thermal polyamide that offers wicking properties and warmth. The thermal top is a long sleeved vest with round neckline with shiny stripes Extra flat seams for maximum comfort with hand felt softness Two-layers dual-tex premium knit construction for maxium warmth during winter sports or outdoor activities Our women's winter thermal sets are made from high performance dual layers cotton-poly knit fabrics. This winter underwear sets offers breathability and wicking properties and warmth. This woman long johns set features hand felt softness, stretch ability, and stylish construction. The dual tech knit construction offers moderate fabric density to maximize body heat retention without weighing you down. This product comes in two pieces set, top and bottom.